I am getting an error in one of my forms that I have not seen before.
Error 1903 (String is too long to fit).

The line that crashes is calling a modal form and passing a form property as a parameter. I have not determined the limit size of the parameter, but LEN(THISFORM.MyProp) = 100 works, and LEN(THISFORM.MyProp) = 400 does not.

I can call the same form from the command window with
lcText = REPLICATE("W",405)
DO FORM Myform WITH lcText

and I don't get the error.

Does anybody know what causes this?