How to do composite SMO the Bound to fields are different?

So one SMOA has the ID in format K2:domain/userA

the other SMOB has the ID in format domain/userA

How on earth can you get this to work when creating a compositive if SMOA doesn't match each other when doing Method bindings.

I have tried all sorts, no joy at all, some smartobejcts use K2:, others use K2 and then some just have domain, is there are way while doing the mappings to get round this?

My lookup won't work because SMOB expects it to be the format domain/userA, but SMOA only have fields showing K2:/domain/userA

Any ideas?

Thanks