Need help to validate the assignment status when adding the contingent worker

Summary:

To throw an error message when the assignment status in "AA-ENTER STATUS" while adding a Contingent worker or Add Contingent Workrelationship

Content (required):

We have a requirement to throw an error message when the assignment status in "AA-ENTER STATUS" while adding a Contingent worker or Add Contingent Workrelationship.

Customer name is Williams-Sonoma, Inc. and approved usecase number is #13

I am getting the error message for all assignment status while adding the contingent worker.

Please help me on this issue.

Version (include the version you are using, if applicable):

REL 13 20 C

Code Snippet (add any code snippets that support your topic, if applicable):