Caution: Source list will be deleted for all materials!

What causes this issue?

You have not entered any selection criteria with regard to the
materials. The source list will therefore be deleted for all materials.

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 check that your input is correct. If appropriate, restrict the
selection of materials affected.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.