Material &1 does not exist

What causes this issue?

You entered a terms of payment that is not allowed for
<GL:vendors>vendors</>.

How to fix this error?

Please correct your entry.
If, on the other hand, you want to also use this terms of payment
for vendors, you must also allow it for this account type.
IF &DEVICE&='SCREEN'
<ds:TRAN.OBB9>Proceed</
ENDIF

Error message extract from SAP system. Copyright SAP SE.