wrong(?) linked-groups pdbx_entity_branch_link:chem_comp_atom:1,2

[wojdyr]

This pdbx_item_linked_group (pdbx_entity_branch_link 1 pdbx_entity_branch_link:chem_comp_atom:1):

mmcif_pdbx/extensions/entity_branch-extension.dic

Line 41 in 281da96

pdbx_entity_branch_link 1 pdbx_entity_branch_link:chem_comp_atom:1 . .

has relations with parents in two different categories: chem_comp_atom and pdbx_entity_branch_list:

mmcif_pdbx/extensions/entity_branch-extension.dic

Lines 67 to 71 in 281da96

	# Hand crafted - keep 1 and 2 separate
	pdbx_entity_branch_link 1 '_pdbx_entity_branch_link.atom_id_1' '_chem_comp_atom.atom_id' chem_comp_atom
	pdbx_entity_branch_link 1 '_pdbx_entity_branch_link.entity_branch_list_num_1' '_pdbx_entity_branch_list.num' pdbx_entity_branch_list
	pdbx_entity_branch_link 1 '_pdbx_entity_branch_link.leaving_atom_id_1' '_chem_comp_atom.atom_id' chem_comp_atom
	pdbx_entity_branch_link 1 '_pdbx_entity_branch_link.entity_id' '_pdbx_entity_branch_list.entity_id' pdbx_entity_branch_list

The same with the next linked group: pdbx_entity_branch_link:chem_comp_atom:2.

It looks wrong – in general these relationships have one child category and one parent category.
Is it a mistake?