Regrind part not relieving

We Issue material via mass issue to MFG. For some reason the regrind is not relieving I have the regrind part # checked to backflush. It happens to a few of our parts. What am i missing.

If a material is marked as backflush it will not show up in mass issue. It needs to be tied to an operation on the job and when qty is reported for the operation it will be relieved.

@taustin backflush material needs a related operation to fire and the input warehouse and bin need to be set somewhere in the hierarchy in this KB KB0112460. We use the resource group of kitting to fire ours, so when kitting moves a quantity that quantity of backflush material is also moved. Also the backflushing process has to be running on a schedule.