I have a dropdown parameter that has not been fed from it's own dataset, it has for Available Values various specified values from different columns in the main dataset (f.ex. A,B,C,D), and No Default Value. It works fine when interacting with other parameters
when a user selects one of the values. How can i add a "All" feature for this type of the parameter (i've found some solutions but they work only for params that are made on top of it's own dataset, which this is not a case)? The report is based on a stored
procedure, and to repeat, this parameter is consisted of several columns in the main dataset.
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