Hi,
But the coding there and the referenced Note are very explicit as to why you cannot achieve that at this point in processing... It is too late to validate something within the logic that is registering "modules" for asynchronous update; it may and therefore will sooner or later lead to inconsistent updates. It's difficult to suggest anything without knowing specifics, but all validations that user should react to must happen prior to MB_POST_GOODS_MOVEMENT call - somewhere within MB_CREATE_GOODS_MOVEMENT, for example.
cheers
Janis