Can an invoice be processed with current date if Pick/Pack has future date?

I have a pick/pack that was done with a 8/7/19 future date in error.  I don’t believe that the pick/pack can be deleted or the date changed on it but need to know if I change the date on the invoice how it will affect the information processed. How does it affect inventory, general ledger etc.? I had an RMA created and thought that if the product was received in Sage with the same date I could process the credit and it would equal it out however Shipping processed the RMA with a current date instead of the 8/7/19 date.  Now we have a pick/pack for the credit with the wrong date.