If a business object calls its FillByParent() method and the parent's CurrentView contains no rows, the SQL statement that is built will not be properly formatted and a SQLException will be thrown ("incorrect syntax...").  If the parent business object's CurrentDataTable has at least one row, the problem can be worked around by blanking out the RowFilter property of the parent's CurrentView before calling FillByParent() and then reestablishing it after FillByParent() completes.  If you have any questions, let me know.