Slicer issue

[Fredrik]

Hi,

I´m trying to use a paramter condition in a slicer and my question is if this definition is working in a slicer:

IF( ?Prans53? is NULL) THEN
([E Motpart 100 - 899]) ELSE
([Motp])

I get a warning if I validate the expression: "OP-ERR-0233 Slicer Member Set expression IF( ?Prans53? is NULL) THEN([E Motpart 100 - 899]) ELSE ([Motp]) is invalid"

But when I run my report everything seems to work fine. Can I ignore the warning or what can go wrong?

Regards

Fredrik