You cannot select the backflush checkbox; PMR exists for component &1

What causes this issue?

If a production material request has been created without the backflush
checkbox being selected, it might be too late to select the backflush
checkbox since the goods issue may already have been posted in SAP
Extended Warehouse Management (SAP EWM).

System Response

You cannot select the backflush indicator.

How to fix this error?

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.