Data grid2 values

Hi Reader, I am Developing Pharmacy app I do have entity called Purchase item ,Item and Connector (3 entities A shown below )   And Am using data grid 2 to show the patient bill    ProductName and MRP are coming from Purchase entity  Quantity and rate are from Item Entity   here the problem is if i gave quantity value 1000.its taking for 2nd productname also 1000. How to solve this issue can any one help me on this thanks           How to get assoscaite value in the data grid 2   
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