Why do we get the warning message as ‘DRUG LICENSE NO NEARING EXPIRY’ on Sales Order next button on header?

Cause: System shows the warning as ‘DRUG LICENSE NO NEARING EXPIRY’ on Sales Order next button on header when the drug licence valid upto date is less then Sales order date.
Remedies:
Use needs to edit the customer master,In tax group edit the Valid upto date for drug lic no of the particular customer and save the record.
For Customer Master Goto SCM Setting-> Master-> Customer-> Customer