Sales area & & & does not exist

What causes this issue?

The error analysis for the incorrect record shows that the sales area
does not exist.

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?

If the assignment is no longer required, delete this row. Otherwise,
create a sales area and restart the assignment.

Error message extract from SAP system. Copyright SAP SE.