Diagnosis
You are processing a configurable BOM with reference to a change numberwhich has a valid-from date in the past.

System Response
If you want to maintain object dependencies with reference to a changenumber, the valid-from date of the change master record cannot be inthe past.

Procedure
You see this message as a warning. You can still process the BOM withreference to this change number, but you cannot change the objectdependencies for an item.