Change the Rowsource, Property of the ITEM control and write one line VBA code on AfterUpdate Event like this:
Change the ROWSOURCE of Item filed to Select ITEM_CODE, MIN_QTY FROM YourPic2Table ORDER BY ITEM_CODE.
Now go to the Format tab of Property Sheet and change the Column Count to 2 and next set Column Width = 1,0
Once you are done with the above steps now write the code on the VBE window under Control After Update Event.
Me.QTY = NZ(Me.Item.Column(1),0)