Key for the sales area was not entered completely (product &3)

What causes this issue?

You entered sales organization &V1& and distribution channel &V2& as a
key. An entry has to be made for both key fields.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.