Multiple active implementations for definition &

What causes this issue?

There are multiple active implementations of the same filter value of
the same BAdI definition, even though this is not allowed.

System Response

This is not correct and should not occur/is impossible.

How to fix this error?

Deactivate the implementations active for this BAdI definition one by
one until not more collisions occur.
You should use transaction SE18 (Utilities -> Adjustment ->
Multiple-use interfaces) to solve thes conflicts systematically.

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.