Open Invoices and Gen. Prod. Posting Group

I have about 600 open invoices sitting waiting to be posted and need to change the Gen. Prod. Posting Group. Is there an easy way to do this? I don’t have any programming experience. May be easiest for me to delete all one by one and re-import? Thanks.

You should write a report with one data item on based on Sales Header (or Purchase Header) validating the new value Gen. Prod. Posting Group but if you don’t have any skill in programming you have only two choices: validating the data manually on all the documents or delete them and re-import.