Hi guys!
I have this problem and I cant figure it out how many times I have tried it myself.
I have this subform, and it has 4 textbox: three that is bound and the one that is unbound form.
when I do calculations in the bound textbox, i can successfully arrive at the sum of textbox3 but when I sum the fourth unbound textbox, it give an error inside the textbox.
Does it mean I cannot make a summation of an UNBOUND textbox?