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answered Feb 8 '16
Unless we're talking about very old version of PSS/E I'd highly recommend using Python instead. ierr = load_chng_4(i, id, intgar, realar) is what you're most probably looking for. See more details on page 2-36 or 724 in your API.pdf
ierr = load_chng_4(i, id, intgar, realar)