Item &1 and contra item &2 have different breakdowns

What causes this issue?

Item &V1& and contra item &V2& should share the same breakdown category
and, thus, the same breakdown attributes.

System Response

Warning message

How to fix this error?

If applicable, enter a different (more suitable) contra item in the
master record of item &V1&.

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.