diff --git a/CHANGELOG.md b/CHANGELOG.md
index be462a1c..f2278b5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,3 +27,24 @@ Improve the description of FlexRequestMessageID and D-PrognosisMessageID fields
 
 ### Removed
 Reference from FlexSettlement and FlexSettlementResponse - These fields supplied the same functionality as the FlexSettlementMessageID field. Now please use the FlexSettlementMessageID field in the FlexSettlementResponse
+
+## [3.1.0] - 2024-11-05
+
+### Added
+* Added attribute(s) in `FlexRequestType`
+    * `Unit`: so that the aggregate knows which in with unit of power the message sent
+* Added attribute(s) in `FlexReservationUpdateType`
+    * `Service Type`: so that the aggregate knows which service is being requested
+    * `Unit`: so that the aggregate knows which in with unit of power the message sent
+* Added attribute(s) in `FlexReservationUpdateISPType`
+    * `Disposition`: ? so that the aggrate knows whether the Power specified for this ISP represents available capacity or a request for reduction/increase.
+* Added attribute(s) in `FlexOfferType`
+    * `Service Type`: so that the DSO knows which service is being requested
+    * `Unit`: so that the DSO knows in which unit of power the message sent
+* Added attribute(s) in `FlexOrderType`
+    * `Service Type`: so that the aggregate knows which service is being requested
+    * `Unit`: so that the aggregate knows in which unit of power the message sent
+* Added attribute(s) in `PrognosisType`
+    * `Unit`: so that the DSO knows which in which unit of power the message sent
+* Added attribute(s) in `FlexSettlementType`
+    * `Unit`: so that the aggregate knows in which unit of power the message sent
\ No newline at end of file
diff --git a/USEF Flex Trading Protocol Specifications 3.0.0.docx b/USEF Flex Trading Protocol Specifications 3.0.0.docx
index f7696cd1..b4d33c8a 100644
Binary files a/USEF Flex Trading Protocol Specifications 3.0.0.docx and b/USEF Flex Trading Protocol Specifications 3.0.0.docx differ
diff --git a/USEF Flex Trading Protocol Specifications 3.0.0.pdf b/USEF Flex Trading Protocol Specifications 3.0.0.pdf
index f2f8518c..d43c0d4b 100644
Binary files a/USEF Flex Trading Protocol Specifications 3.0.0.pdf and b/USEF Flex Trading Protocol Specifications 3.0.0.pdf differ
diff --git a/xsd/UFTP-agr-dso.xsd b/xsd/UFTP-agr-dso.xsd
index a67615c2..c62e4b96 100644
--- a/xsd/UFTP-agr-dso.xsd
+++ b/xsd/UFTP-agr-dso.xsd
@@ -50,6 +50,11 @@
                             prognosis is sent. The combination of SenderDomain and PrognosisSequence should be unique</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The unit of Power that applies to the Power of the ISP's.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -59,8 +64,7 @@
     <xs:complexType name="D-PrognosisISPType">
         <xs:attribute name="Power" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power specified for this ISP in Watts. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
-            </xs:annotation>
+                <xs:documentation>Power specified for this ISP in the given PowerUnit. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>            </xs:annotation>
         </xs:attribute>
         <xs:attribute name="Start" type="xs:integer" use="required">
             <xs:annotation>
@@ -114,11 +118,21 @@
                         <xs:documentation>Reference to the bilateral contract in question.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="ServiceType" type="xs:string" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>Service type for this request, the service type determines response characteristics such as latency or asset participation type.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
                 <xs:attribute name="Reference" type="xs:string" use="required">
                     <xs:annotation>
                         <xs:documentation>Message reference, assigned by the DSO originating the FlexReservationUpdate.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The unit of Power that applies to the Power of the ISP's.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -126,9 +140,10 @@
     <!-- Flex Reservation Update ISP Type -->
     <!-- -->
     <xs:complexType name="FlexReservationUpdateISPType">
+        <xs:attribute name="Disposition" type="AvailableRequestedType" use="optional"/>
         <xs:attribute name="Power" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Remaining reserved power specified for this ISP in Watts.</xs:documentation>
+                <xs:documentation>Remaining reserved power specified for this ISP in the given PowerUnit.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="Start" type="xs:positiveInteger" use="required">
@@ -189,6 +204,11 @@
                         <xs:documentation>Service type for this request, the service type determines response characteristics such as latency or asset participation type.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The unit of Power that applies to the Min/Max Power of the ISP's.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -199,12 +219,11 @@
         <xs:attribute name="Disposition" type="AvailableRequestedType"/>
         <xs:attribute name="MinPower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power specified for this ISP in Watts. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
-            </xs:annotation>
+                <xs:documentation>Power specified for this ISP in the given PowerUnit. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>            </xs:annotation>
         </xs:attribute>
         <xs:attribute name="MaxPower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power specified for this ISP in Watts. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
+                <xs:documentation>Power specified for this ISP in the given PowerUnit. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="Start" type="xs:positiveInteger" use="required">
@@ -259,6 +278,11 @@
                         <xs:documentation>Reference to the concerning contract, if applicable. The contract may be either bilateral or commoditized market contract.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="ServiceType" type="xs:string" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>Service type for this request, the service type determines response characteristics such as latency or asset participation type.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
                 <xs:attribute name="D-PrognosisMessageID" type="UUIDType" use="optional">
                     <xs:annotation>
                         <xs:documentation>MessageID of the D-Prognosis this request is based on, if it has been agreed that the baseline is based on D-prognoses. </xs:documentation>
@@ -274,6 +298,11 @@
                         <xs:documentation>ISO 4217 code indicating the currency that applies to the price of the FlexOffer.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The unit of Power that applies to the Power of the ISP's within the OfferOptions.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -309,8 +338,7 @@
     <xs:complexType name="FlexOfferOptionISPType">
         <xs:attribute name="Power" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power specified for this ISP in Watts. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
-            </xs:annotation>
+                <xs:documentation>Power specified for this ISP in the given PowerUnit. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>            </xs:annotation>
         </xs:attribute>
         <xs:attribute name="Start" type="xs:positiveInteger" use="required">
             <xs:annotation>
@@ -387,6 +415,11 @@
                         <xs:documentation>Reference to the concerning bilateral contract, if applicable.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="ServiceType" type="xs:string" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>Service type for this request, the service type determines response characteristics such as latency or asset participation type.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
                 <xs:attribute name="D-PrognosisMessageID" type="UUIDType" use="optional">
                     <xs:annotation>
                         <xs:documentation>MessageID of the D-Prognosis this request is based on, if it has been agreed that the baseline is based on D-prognoses. </xs:documentation>
@@ -422,6 +455,11 @@
                         <xs:documentation>The activation factor for this OfferOption. The ActivationFactor must be greater than or equal to the MinActivationFactor in the OfferOption chosen from the FlexOffer.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The unit of Power that applies to the Power of the ISP's.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -429,7 +467,7 @@
     <xs:complexType name="FlexOrderISPType">
         <xs:attribute name="Power" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power specified for this ISP in Watts. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
+                <xs:documentation>Power specified for this ISP in the given PowerUnit. Also see the important notes about the sign of this attribute in the main documentation entry for the ISP element.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="Start" type="xs:positiveInteger" use="required">
@@ -478,6 +516,11 @@
                         <xs:documentation>ISO 4217 code indicating the currency that applies to all amounts (flex price, penalty and net settlement) in this message.</xs:documentation>
                     </xs:annotation>
                 </xs:attribute>
+                <xs:attribute name="Unit" type="PowerUnitType" use="optional">
+                    <xs:annotation>
+                        <xs:documentation>The power unit that applies to all given powers in this message.</xs:documentation>
+                    </xs:annotation>
+                </xs:attribute>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>
@@ -546,28 +589,27 @@
         </xs:attribute>
         <xs:attribute name="BaselinePower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Power originally forecast (as per the referenced baseline) for this ISP in Watts.</xs:documentation>
+                <xs:documentation>Power originally forecast (as per the referenced baseline) for this ISP  in the given PowerUnit.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="OrderedFlexPower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Amount of flex power ordered (as per the referenced FlexOrder message) for this ISP in Watts.</xs:documentation>
+                <xs:documentation>Amount of flex power ordered (as per the referenced FlexOrder message) for this ISP in the given PowerUnit.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="ActualPower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Actual amount of power for this ISP in Watts, as measured/determined by the DSO and allocated to the AGR.
-                </xs:documentation>
+                <xs:documentation>Actual amount of power for this ISP in the given PowerUnit, as measured/determined by the DSO and allocated to the AGR.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="DeliveredFlexPower" type="xs:integer" use="required">
             <xs:annotation>
-                <xs:documentation>Actual amount of flex power delivered for this ISP in Watts, as determined by the DSO.</xs:documentation>
+                <xs:documentation>Actual amount of flex power delivered for this ISP in the given PowerUnit, as determined by the DSO.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
         <xs:attribute name="PowerDeficiency" type="xs:integer" use="optional" default="0">
             <xs:annotation>
-                <xs:documentation>Amount of flex power sold but not delivered for this ISP in Watts, as determined by the DSO.</xs:documentation>
+                <xs:documentation>Amount of flex power sold but not delivered for this ISP in the given PowerUnit, as determined by the DSO.</xs:documentation>
             </xs:annotation>
         </xs:attribute>
     </xs:complexType>
diff --git a/xsd/UFTP-common.xsd b/xsd/UFTP-common.xsd
index 69dd8dcd..6239da6a 100644
--- a/xsd/UFTP-common.xsd
+++ b/xsd/UFTP-common.xsd
@@ -226,4 +226,14 @@
     <xs:element name="SignedMessage" type="SignedMessageType"/>
     <xs:element name="TestMessage" type="TestMessageType"/>
     <xs:element name="TestMessageResponse" type="TestMessageResponseType"/>
+    <!-- -->
+    <!-- -->
+    <!--  Power Unit Type -->
+    <!-- -->
+    <xs:simpleType name="PowerUnitType">
+        <xs:restriction base="xs:string">
+            <xs:enumeration value="Watt"/>
+            <xs:enumeration value="VAR"/>
+        </xs:restriction>
+    </xs:simpleType>
 </xs:schema>