Nope, standard green screen in R6 even (maybe even R5).  Just go to customer
maintenance and have a close look at the Y/N fields, one of them is the
mandatory PO nr entry.  
Although on rereading I see you talk about PO LINE numbers and not just PO
number.  If I misunderstood you could use the user sequence nr or a user
field for this and a user exit if you want an additional line nr , and then
you would be customizing (although only slightly, user exits are handy
things).  Done some stuff like this already
Hope this helps,
Kris
-----Original Message-----
From: mapics-l-bounces@xxxxxxxxxxxx [mailto:mapics-l-bounces@xxxxxxxxxxxx]
On Behalf Of Eric Wolf
Sent: maandag 6 augustus 2007 20:31
To: mapics-l@xxxxxxxxxxxx
Subject: Re: [MAPICS-L] COM - purchase order line numbers
   Kris,
   Let me guess - R7 version?
   Eric
     ----------------------------------------------------------------------
     From:  "Kris De Vlieger" <kris.devlieger@xxxxxxxxxx>
     Reply-To:  MAPICS ERP System Discussion <mapics-l@xxxxxxxxxxxx>
     To:  "'MAPICS ERP System Discussion'" <mapics-l@xxxxxxxxxxxx>
     Subject:  Re: [MAPICS-L] COM - purchase order line numbers
     Date:  Mon, 6 Aug 2007 20:23:27 +0200
     >Yes, flag it (per customer in the customer master).
     >
     >-----Original Message-----
     >From: mapics-l-bounces@xxxxxxxxxxxx
     [mailto:mapics-l-bounces@xxxxxxxxxxxx]
     >On Behalf Of Greg Wenzloff
     >Sent: maandag 6 augustus 2007 19:26
     >To: MAPICS ERP System Discussion
     >Subject: [MAPICS-L] COM - purchase order line numbers
     >
     >Is there any simple way to make the purchase order line number a
     >mandatory entry field in a customer order?
     >
     >Greg
     >
     >XAR4
     >
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