It is not possible to delete contract partner &1

What causes this issue?

You tried to delete a contract partner, but deletion is not possible for
this partner.
You can only delete contract partners, for whom one of the following is
noted in the <LS>Note</> column:
Added Locally
Deleted in Source System

How to fix this error?

Delete the contract partner in the source system (for example, in SAP
CRM).

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.