Filtering a Data Region by using the "IN" Operator

[cs2009]

Using SSRS 2005.

I'm trying to filter a data region by using the "IN" operator, but the region returns no records. I've tried different variations for the value expression such as:

GL, A6, B6, C6, H6, GV, A7, B7, C7, H7, GR, A8, B8, C8, H8, GS, A9, B9, C9, H9

or

Join(GL, A6, B6, C6, H6, GV, A7, B7, C7, H7, GR, A8, B8, C8, H8, GS, A9, B9, C9, H9,",")

Help.

 

[RiverGuy]

Can you make this a parameter or hidden parameter? I've had luck filtering on an IN when using a parameter.

 

[cs2009]

Thanks, RiverGuy. If using a parameter is the only way to make the "IN" operator work then I will use one.