Classification data is already maintained for business partner

What causes this issue?

You want to create classification data for the business partner. This
data exists already.

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?

You can only change the existing classification data for the business
partner.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.