There is no specific “Reminder” in SAP once you’ve carried out a goods receipt. You can see that a goods receipt has been done a number of ways. If you know the material, plant, SLoc you could search in MB51 for the document number. If you know the PO number you could check in ME2N, the vendor number ME2L and the material number ME2M to see if there are any items left to be delivered on the PO. You could also check in ME23N if you have the PO# and look at the purchase order history under the item detail.
It depends on the information you have as to the transaction you would use.
Hope this helps