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After a manual change, always save the case to "work.sav" before executing fnsl, test the outcome of fnsl using "solved()":

psspy.save('work.sav')
ieer = psspy.solved()
if ieer>0: pssy.case('work.sav')

Once done with your manual changes, saved final case in memory to a different name.

After a manual change, changes, always save the case to "work.sav" before executing fnsl, test the outcome of fnsl using "solved()":

psspy.save('work.sav')
ieer = psspy.solved()
if ieer>0: pssy.case('work.sav')

Once done with your manual changes, saved final case in memory to a different name.