Very many thanks, Dr. Wicklin. You are correct that opt[2]= does not allow the print command in NLPNRA subroutine as it invokes printing based on the value on opt[2]= (say, 4 in this case). Print statement and opt[2] argument contradict each other and this makes SAS system un-operational (as a result we have to re-start the SAS session). I think this is a technical issue SAS will take care about the matter in future.
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