Customer & is not entitled to rebate

What causes this issue?

Customer &V1& is not entitled to rebate.

System Response

If this customer has the function of a payer in orders or billing
documents, no rebate conditions are granted. No accruals can be created
for these documents.
Also, you cannot carry out a settlement for a payer not entitled to
rebate.

How to fix this error?

Check, whether Customer &V1& should be entitled to rebate. You can
maintain the "Rebates" indicator in the billing screen of the customer
master.

Error message extract from SAP system. Copyright SAP SE.