Archive PO associated with Maintenance Order

We have maintenance orders back to 2004 that have never been closed or had the delete flag set.  We would like to get these cleaned up.  Many of them have purchase orders attached to them.

I ran MEMASSPO to set the final invoice indicator on the purchase orders that were hanging out there but when I tried to then close the orders and set the deletion flag I couldn't.  I would get an error that the PO still existed.  With production orders I would run RM06EV47 to set the delete flag on the PO then I would be able to close the production order.  This doesn't seem to be the case with maintenance orders.

When I run RM06EV47 on the purchase orders that are associated with maintenance orders I get the message "Archive Run only flags Production Order POs. See BADI."

I haven't been able to find anything regarding how to set the delete flag on these POs.  Can someone tell me what the process is?

Thanks much,

Andrea