Enter a correct discount/charge key

What causes this issue?

You did not enter a discount/charge key, or the discount/charge key you
entered has the same name as a <DS:DE.CHGKEY_KK>charge/discount key</>
defined in invoicing.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter a correct discount/charge key.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.