COPYFILTERS vs COPYFILTER

I am combining 2 reports in Navision Attain. Both reports  are using Item table; one is sorted by “No.” and the other by “Inventory Posting Group”. I named the DataItemVarName as Item and Item1. The ReqFilterFields are setup from DataItemVarName: Item.

In Item1, I have problem when capturing all the filters from DataItemVarName: Item.

 OnPreDataItem() I put:

Item. COPYFILTERS(Item1); // this copyfilters doesn’t work.

But, if I put the filter one by one, it's working but it’s not effective to do it this way

Item.COPYFILTER("No.",Item1."No.");

Item.COPYFILTER("Inventory Posting Group",Item1."Inventory Posting Group");

Item.COPYFILTER("Location Filter",Item1."Location Filter");

Item.COPYFILTER("Date Filter",Item1."Date Filter");

Item.COPYFILTER("Customer Filter",Item1."Customer Filter");

Etc…….

 What did I missing?

Thanks

ZB