Relation between VendpackingSlipTrans and purchLine table

Hi ,

I want to create a query in AOT between VendpackingSlipTrans and purchLine table ,i create the first data source from VendpackingSlipTrans table and join purchline table by this relation VendPackingSlipTrans.OrigiPurchId == PurchLine.PurchId 

So my bit is to find Purchline associated with the receiving line and i don't know if this relation is correct 

should i add a new relation in purchline Table ?