Inventory ID that is a result of our production

Hi, We are new to Acumatica and operate a Cow Hide processing plant. During the production process there is leftover flesh that accumulates in our warehouse.  We typically send the excess to a nearby plant, however, that plant is not accepting the material.  This byproduct is left over "trimmings"  from the production process and there will not be a PO to a vendor because it is a waste product of the hides we purchased from vendor(s). 

I created a Non Stock item, that requires a shipment. The issue is in the GL Accounts section.  My best guess is that I should leave the PO Accrual Account empty or connected to the expense account of the warehouse.  Please let me know if there is a actual  solution.