How can we update the new field catalog for the existing sales orders & STOs? As part of gATP, we created a new field catalog (for product allocation) and it is getting updated for the new orders or while doing the re-ATP of existing orders (from R/3 side). We are facing challenges while recording the LSMW for ME22N (re-ATP of existing STOs). As per my understanding product allocation do not work with ME22. Is there any other alternate way to do this task apart from going for a custom program?