Long story short...I was trained by someone who wasn't very familiar with BW.  I just learned I was handling Receipt Adjustments incorrectly.  We are FIFO if that matters.  To adjust a cost on a closed PO I was instructed to perform an Adjustment (NOT RECIEPT ADJUSTMENT) and then recreate the PO adding a -1 (example PO 11111 became PO 11111-1) the new PO would be received at the correct pricing. 

The new owner of the company was looking at different reports and found that we had returned $110,000.00 during May.  This is accurate in the sense that they had me doing Adjustments instead of Receipt Adjustments.  My limited knowledge tells me that this returned amount is offset by the new PO's with proper pricing. 

Is there a way to correct these to the proper way?

If not, how can this be proven to be accurate? Is there a report I can pull up?

Do I leave it as-is and just be diligent it is done properly from now onward?

Thanks in advance, Adam