Passing System.String to a method with LONGCHAR param

There seems to be a problem with the conversion of System.String object containing data longer than the CHARACTER limit, even though the parameter is a LONGCHAR.

We are getting this error;

SYSTEM ERROR: copdtm - maxdlen, data item too large, try to increase -s. (65)

So the method signature looks like this;

SomeMethod(INPUT lcVar AS LONGCHAR).

Being called this way;

THIS-OBJECT:SomeMethod(someDotNetObject:StringProperty). - StringProperty contains more than 32K chars

Will this ALWAYS work;

DEF VAR lcTemp AS LONGCHAR NO-UNDO.

lcTemp = someDotNetObject:StringProperty.

THIS-OBJECT:SomeMethod(lcTemp).