SSRS参数默认选择全部

Question

我目前有一个药物名称参数，根据使用Store参数选择的商店，填充药物列表。下面的查询部分是我用于填充药物名称的数据集。

 alter procedure SSRSReporting.Parameters_Get
    @ParameterName varchar(100),
    @StoreKey varchar(max) = NULL

as


    declare
        @ParameterNameLocal varchar(100),
        @StoreKeyLocal  varchar(max) = NULL

    select
        @ParameterNameLocal = @ParameterName,
        @StoreKeyLocal = @StoreKey

else if @ParameterNameLocal = 'GPIName'
        begin
            declare
                @StoreList table (StoreKey int)

            insert into @StoreList (StoreKey)
                select
                    convert(int,Name) 
                from 
                    SSRSReporting.SplitString (@StoreKeyLocal)
            select
                'All GPIs' as 'Label',
                null as 'Value',
                0 as 'OrderBy'

            union

            select
                DrugName as 'Label',
                GPI as 'Value',
                1 as 'OrderBy'
            from
                Final.FactRXBusinessEffectiveDay fact
                    inner join @StoreList sl
                        on fact.StoreKey = sl.StoreKey
                    inner join Final.DimDrug drug
                        on fact.DrugKey = drug.DrugKey and drug.DEAClass <> 'No DEA Class'
            order by
                'OrderBy',
                'Label'
        end 

主数据集包含以下与药物名称相关的代码

declare @GPINameTable table
(
    GPI varchar(max)
)

if @GPINameLocal IS NOT NULL
begin
    --Multiselect GPIs
    insert into @GPINameTable (GPI)
    select
        Name
    from
        SSRSReporting.SplitString (@GPINameLocal)       
end

    where
        PharmTransDateKey between @StartDateLocal and @EndDateLocal
        and (@GPINameLocal is null or drug.GPI in (select GPI from @GPINameTable))

我目前将药物名称的可用和默认值设置为填充药物名称列表的数据集。我还要提一下，Drug List参数需要多选。

问题是在我选择商店并填充列表后没有选择任何内容。我如何默认选择全部？