EDI: Partner profile does not exist

What causes this issue?

A partner profile could not be found with the following key:
&v1&
This involves the key fields of the table EDPP1:
-PARNUM partner number
-PARTYP partner type

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?

Please check the EDI partner profiles.
IF &DEVICE&='SCREEN'
<ds:TRAN.WE20>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.