expression - avoid grouping on empty values RDLC -

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I have a column set on the datafield. I only need a group when there is a value in the field. This group is still on the tap area.

I have tried the following Group Express: 

  = Field! ScaleName.Value & lt; & Gt; "" Or field! ScaleName.Value & lt; & Gt; You can solve this problem using a group filter (right click on the group << code>   
 
 Group Properties >  Filters ): 
 
     
  •  Expression:  = None (field! ScaleName.Value)  
    •  Boolean  
  •  Operator:  =  
    •  
  •  Value:  = Incorrect  
    •

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