Automatic Credit Check happen before 2 day to delivery and PGI date,,

Dear Guru,

In Present System Automatic Credit Check is Mapped, Credit check is happening at Sales order lever for High Risk Customers, At Delivery level for Medium Risk Customers and At PGI level for Low Risk Customers.

Client Requirement is Medium risk customers Credit Check should happen before 2 days to Delivery Date, For low risk customers Credit check should happen before 2 days  PGI  date, by that if any document going to credit block they inform to customer Well and before to avoid credit block for right time delivery,

Please help me out how to fulfill the client requirement

Thanking in advance,

Best regards,

Sudheer.U