Receipt is missing the GL Business Unit

We are having an issue with the GL Business Unit and/or Account missing on receipts.  The PO has these chart fields, but when entering a receipt and saving they are not populated.  This causes a match exception on the voucher due to it not matching.  It seems to happen when the Receipt BU and the PO BU are different; however, I have not been able to replicate this in my testing.  It doesn't occur all the time.

Please advise if you have seen anything like this.

Thank you,

Debra Ziglar