Not possible to filter for more than one dimension in Datasource script filter method?

Hi experts.

We have a scenario where we need to apply filter on multiple dimensions .Eg.

We have one data source DS1 with Dimension HUb and material_grp .

Now we want to filter the DS1 with HUB and Material_grp at the same time.

I am using below statement to apply filter.

DS_1.setFilterExt("ZHUBCODE", "HUB1" );

DS_1.setFilterExt("ZMAT_GRP", "MATG1" );    //Clears HUB filter and shows data for all HUBS , filter with material group only

But Setfilter method first delete the last filter and apply new one.And set filter method takes only one dimension at a time.

Please help me in this