Many thanks for an exhaustive answer.
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SET_NUMMER = slGetUnusedSetNumber
SEL_STRANG = "SELECT * FROM ART WHERE ARTNR= " + $SQ + TRIM$(ART.ARTNR) + $SQ
SVAR = slSel(SEL_STRANG, SET_NUMMER) ' Ska ge noll
IF SVAR <> 0 THEN
KOM.FELTEXT = "SYSTEMFEL i ARTIO GU slSel=" + STR$(SVAR) <<============