Hi Shailesh,
You will need to find the Item Ledger Entry no. for the corresponding sales line. This entry no. you can find it in “Item application entry” as Outbound entry and the related Inbound entry is you purchase in case if there is no transfer of material. Remember on thing… Inbound is you positive inventory from where the material can be sold out or made negative and outbound is the entry no of sale or inventory which is making negative effect.