An error occurs when trying to change the collection trigger of a quality collection plan

Hi,

Need to change the current collection trigger assigned to a collection plan which is "item" to the "item category".

Following error message generates when trying to change the collection trigger.

"APP-FND-00730: This flexfield has an invalid value set. It may use a special value set that uses an Edit event user exit, and the user exit has failed. If you are using a form on a graphical user interface (GUI) you may have an invalid value set of a different type, possibly a table-validated value set where the table or view does not exist or where there is an invalid WHERE clause.