Works -
->addOperation(new ManageOfferOp($asset1, $asset2, 0.0000001, new Price(10100000,10000000)))
Fails -
->addOperation(new ManageOfferOp($asset1, $asset2, 0.0000001, new Price(9900000,10000000)))
Difference being, 1.01 exchange rate vs 0.99. 0.99 fails with no error message.
I'm confused how to sell asset1 for 0.99 then.