No tax code found for difference

What causes this issue?

The invoice to be checked contains a difference. Since the system
cannot determine a tax code in the invoice items, the difference
cannot be assigned a tax code. The invoice cannot be correctly
verified.

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?

Error message extract from SAP system. Copyright SAP SE.