Enter a supplier

What causes this issue?

Based on your entries in the <ZH>Allocation</> area, the system tries to
determine the supplier. If this is not possible, you must enter a
selection supplier.
This can occur, for example, if you want to post the invoice in the
background and allocate it to a delivery note that has not yet been
entered at goods receipt in the system.

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?

Check the allocation criteria entered and make any necessary
corrections.
If the allocation criteria are correct, enter the supplier number in the
<ZH>Selection supplier</> field.

Error message extract from SAP system. Copyright SAP SE.