We needed to change the COUPON field in FILE1 to N if it was a Y and where the order type was FE or CE. The COUPON field is embedded in position 38 in FILE1 field CSFILL which is 50 characters long and the order type is in FILE2.
Update FILE1 set csfill = (substr(csfill,1,37) || 'N' || substr(csfill,39,12) where FILE1/cstno in ( select FILE2/cscstn from FILE2 where ORDERTYPE = 'FE' or ORDERTYPE = 'CE') and substr(csfill,38,1) = 'Y'
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This was first published in August 2002