Custom Paper for Smartforms

Lately I faced the problem, that I had to print a SF (Paper Size 101mm x 297mm) from a tray. The printer allways got an error saying “Wrong paper size, please insert Legal”. Some nice guy from the development departmend suggests to try the following: use a SAPWIN printer, because in that way the settings of the printer driver are relevant. I’ll try next time and describe here if it worked.