How to restrict PO NeedBy Date to particular days in a week!

Hi All,

I came across one requirement earlier in purchasing.

While creating PO if the buyer enters the NeedBy date as whichever date falls in Friday and Saturday(Week end off), the system should throw an error stating the NeedBy date cannot be on Friday and Saturday. This is to avoid putting receipt on week off.

Is this can be achieved in standard functionality?

Please suggest the solution.

Thanks,

Guru