Under what circumstance is the field Process Loss Qty visible in Work Order?

Hello,

While customizing Work Order I found a filed called Process Loss Qty.

I tried many ways but could not get it to appear on screen except by removing the code eval: doc.process_loss_qty in Depends On.

I would like to know that under what circumstances is this field visible and can we use it for entering Rejection quantity?

TIA

Yogi Yang