Hi Tamar,
Goods Receipt is not part of CashFlow, only PO or Inovices.
In the PO, the system calculates the Due Date based on "Delivery Date" and "Payment Terms". for example: If Delivery date is 15.07.2015 and Payment terms is 15 days, the due date is 30.07.2015.
When you receive the invoice, the cashflow line will change from one level (PO Level) to another (Vendor). I don't remember if the Goods Receipt date is different from the expected Delivery Date on the PO, it will adjust the due date on the PO , ie: Delivery Date 15.07.2015 but Goods received on 18.07.2015 due date will move to 02.08.2015
Check "SPRO: Financial Supply Chain Management -> Cash and Liquidity Management -> Cash Management -> Structuring -> Define planning levels for logistics
Kind Regards