Due to a production reporting error, I had to reverse some production work orders.  I keyed new WO's with negative quantities, keyed replacement positive WO's for correct production info and posted all WO's at same time using WO-P Batch Finished Production in Evo.  The positives posted and backflushed fine.  The negatives posted the quantities to the FG items, but did not backflush any the BOM materials back into inventory leaving my components out of balance.