Identical account assignment object when using contract object

What causes this issue?

The calculation of distribution entries results in identical entries.
The reason for this is that contract objects with the same account
assignment object are used for the distribution divided equally.

System Response

It is not possible to perform the change of conditions.

How to fix this error?

Change the distribution object in the condition by assigning the
contract object directly or use another distribution rule.

Procedure for System Administrators

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.