Thanks Satya, this looks like it worked perfectly.

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of satya tiruveedhi
Sent: Thursday, October 08, 2015 11:14 AM
To: midrange-l <midrange-l@xxxxxxxxxxxx>
Subject: Re: update field based on substring of numeric field

update tstmis/actfile a
set umnum = (select substring(digits(umnum),6,4) from tstmis/shactfile b where a.umact = b.umact and b.umnum > 0 and a.umnum = 0 ) where exists (select 1 from tstmis/shactfile b where a.umact = b.umact and b.umnum > 0 and a.umnum = 0 )
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