The OIW catalog is incorrect

What causes this issue?

The OIW information catalog contains OIW objects, which have additional
nodes or OIW objects attached to them.

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?

Please correct the OIW information catalog. The OIW objects are
highlighted in color. The colors are explained in the color key.

Error message extract from SAP system. Copyright SAP SE.