Stored procedure do not work properly please help me.....

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SQL-Server

SQL-Server-2008R2

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Stored Procedure do not work properly please help me.....

this Stored Procedure do not work properly it is run but do not calculate automatically...

For Example

ISNULL( (tp.qty-ts.qty),0) as Closing_Stock

this line is not work(purchase - sale quantity) if i change it for test to--

ISNULL( (tp.qty-1),0) as Closing_Stock

then it work and also same problem this line

ISNULL( (i.brate*(tp.qty-ts.qty)),0) As Amount

please help me

What I have tried:

select  c.catnm, i.itemnm, i.opnstk, u.untnm, (i.ITMcgst*2) as StkGSTRate, ISNULL( tp.qty,0) as purchaseQty, ISNULL( TS.qty,0) AS SaleQty ,
ISNULL( tpr.qty,0) as Purchase_Return_QTY,ISNULL( tsr.qty,0) as Sale_Return_QTY , ISNULL( (tp.qty-ts.qty),0) as Closing_Stock
,ISNULL( i.brate,0) as brat,ISNULL( (i.brate*(tp.qty-ts.qty)),0) As Amount,lsd.lastSaleDate ,LPD.lastPurchaseDate

  from tbl_item i
    JOIN tblcat  c    ON c.catid=i.ITMcatid
    JOIN tblUnit u    ON u.untid=i.ITMunitid
    
    LEFT JOIN (select ItemIDpur  as itemid, sum(PDQty) As qty FROM TBL_pur_invdet  where p_type='P' group by ItemIDpur)  tp  ON i.itemid=tp.itemid
    LEFT JOIN (select ItemIDSALE as itemid, sum(SDQty) As qty FROM TBL_sale_invdet where S_type='S' group by ItemIDsale) ts  ON i.itemid=tS.itemid
    
    LEFT JOIN (select ItemIDpur  as itemid, sum(PDQty) As qty FROM TBL_pur_invdet  where p_type='PR' group by ItemIDpur)  tpr  ON i.itemid=tpr.itemid
    LEFT JOIN (select ItemIDSALE as itemid, sum(SDQty) As qty FROM TBL_sale_invdet where S_type='SR' group by ItemIDsale) tsr  ON i.itemid=tSr.itemid
           
    LEFT JOIN (select ItemIDSALE as itemid, max(SaleInvdt) As lastSaleDate     FROM TBL_sale_invdet where S_type='S' group by ItemIDsale) LSD  ON i.itemid=LSD.itemid
    LEFT JOIN (select ItemIDpur  as itemid, max(purdate)   As lastPurchaseDate FROM TBL_pur_invdet  where P_type='P' group by ItemIDpur)  LPD  ON i.itemid=LPD.itemid