hello guys, im trying to put in one text box, which will sum up the qsdok.mnozstvi for substring(qsdok.pracoviste)1,2 lower than 3 (i have pracoviste 1, 2 and 3) (without substring the pracoviste is like M1, M2, M3) but i still get error in my code.. {SumIf(qsdok.MNOZSTVI, substring(qsdok.pracoviste...