Help need in this tdl file

Code:

;;===== STOCK item
[*Collection: Vch Stock Item Extract]

    Use            : ExtractAlias Collection
    Source Collection    : Stock Item Src
    Collection        : StockItem PartNo With Closing
    Title               : $$LocaleString:"List of Items                                     Stock Qty     LastSale Price "    
    Fetch               : Name, VchStkItmBalance,LastSalePrice,ClosingBalance
    Set as             : $FirstName
    Keep Source        : ().
    Client Only        : Yes
    Format          : $VchStkItmBalance   : "Base"
    Format          : $LastSalePrice: "Base"
    ;Format          : $RateofMRP: "Base"


   
Filter      : Zero Filter21
[System: Formula]

  
Zero Filter21 : NOT $$IsEmpty:$ClosingBalance

I am getting the empty closing balance but if i want to purchase any new stock, stock item is not allowing
in purchase voucher.

 

Then Write the Formula Like This

ZeroFilter: $$IsPurchase:##SVVoucherType AND Not $$IsEmpty:$ClosingBalance

 

not working

 

Amit sir i want the filter for sales only

 

Thank you amit sir for ur help
got it by changing
Option : RemoveFilteronPur : $$IsPurchase:$VoucherTypeName