How to set Delivery block automatically when the (Price minus Discount) values is lesser than VPRS.

Dear Experts,

I have a scenario where the system needs to set a Delivery block, when the Value (Price (ZPR0) - Discount (ZA00)) is lesser than (VPRS) Material cost value.

I don't want to to do the checks based on Net value cos the Net value includes the Tax and Freight charges.

I come across some blogs and answers, where it is mentioned to develop a routine and assign to Pricing procedure to achieve the above.

However it is not clearly mentioned on the above scenario.

Kindly advise me the program logic to be developed.

Regards,

Ramkumar Lalaram