>>Hmmm, I checked that the length of the passed value is 4, though I only type three chars. I have MaxLenght property set to 4, but I do not see in the code where I add spaces at the end.
>>
>>I guess I have to fix my form's code just to make sure I always pass 4 chars and not less.
>
>I often have problems with extra spaces (from a TextBox) causing unexpected results, so I regularly apply alltrim().
>
>It looks as if you have the opposite problem; you might want to consider applying padr() to get a fixed size.

I did just in case, though I found that the code was already 4 characters. In any case, I switched to SUM vs. SELECT SUM and don't want to spend too much time again on this paradox.