SQl Query Through Plus Minus Stock Statement

Question

 

I have Two Table 

1 table Po Table Field Like PONO,POLI,POQty

2 Table GRN Table Field Like GRNNO,PONO,POLI,GRNQty

3 table is My Output Table 

 

 My Query Like This

Select G.GRNNO,P.PONO,P.POLI,Isnull(P.QTY,0),isnull(G.InQty,0),Isnull(Isnull(P.QTY,0)-Sum(isnull(G.InQty,0)),0) As PendingQty from PO As P Left Outer Join GRN As G ON P.PONO=G.PONO And P.POLI=G.POLI Group By G.GRNNO,P.PONO,p.POLI,P.QTY,G.InQty 

 

But Output Not Exact To  OutPut Like This 

 

Thank in Advance