Not able to select different target bundle for multiple content type in og using og_group_ref field.

I am having two content types using as a group. Let say Group A and B.
I am using these two group content type A & B in other content types og_ref_field as a target bundle. In one content type let say C selecting 'A' in Target bundles and in other content type say D selecting 'B' in target bundle. But not able to select different bundle type for different content type(Like 'A' for C and 'B' for D) using same field og_group_ref created default by og module.