Rec./Hiring Manager able to raise requisitions for a position with approved offer/already filled?

Summary:

Why are the Recruiter and Hiring Manager still able to raise requisitions for a position which either already has an approved offer or is already filled?

Content (please ensure you mask any confidential information):

Hi All,

The Recruiter and Hiring Manager are still able to raise requisitions for a position which either already has a candidate in Offer-Approved state or is already filled.

Because of this multiple requisitions for the same position are getting created by different people (recruiters/ Hiring managers).

What shall we do to stop this issue?

Requesting urgent response and support please.

Best regards

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