How to do restriction on absence once a week?

Summary:

One-time absence request restriction per calendar week.

How do we do it with existing functions?

Content (required):

We want to impose a restriction so that absence entries can be entered once a week.

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

21D (11.13.21.10.0)

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