ABAP Query Quantity totals wrongly - M.Type 101+, 102-

Hi Friends,

Could any one help me in this? I created an ABAP Query for the combination of T.codes MB51 & MB52. When I see the total qty for the item which has GR and Goods return document.........say first by 101 I rerceive 5 nos and using 122 returns 3 nos. Here Query shows total is 8nos instead of 2 nos.

The same way correnponding price also shows for 8nos instead 2 nos.

Kind Regards,

Sankar.K