Can't get swedish stair formula to the stair tool???

[Mats_Knutsson]

Hi,
In sweden the stair formula is 600>=(2*riser+run)<=630.
ArchiCAD won't let me do this...any clue why? No parameters are locked.
Does ArchiCAD need a 50 mm interval!? ..I tested 580-630 which works I need 600-630.
?Mats