Diagnosis
The logical database with which the functional area was created waschanged incompatibly. In particular, tables were removed from the tree.Since the fields of these tables are not used in queries, they wereremoved from the functional area. The structure of the tree was alsochanged. Queries on this functional area therefore might not workcorrectly.

Procedure
Check and revise the functional area. Then check and possibly correctall queries on this functional area.