Diagnosis
No valid CO account assignment could be determined for real estateobject &v1&. It is possible that the real estate object you are using inthe account assignment bar has yet to be released.

Procedure
Check in the RE Navigator (transaction RE80) to establish whether thereal estate object has also been released.
If this message comes from a dialog transaction, then expand the accountassignment bar to determine which master data object is behind thegeneric real estate object number.