That depends on which information you have available and which version of SAP you work with.
In this case I assume that you have the purchase order on which the goods receipt was made.
Start transaction ME23N.
Enter the purchase order number. On the item details section you will find a tab purchase order history (only if a goods receipt has been made). The material document is type WE. Type RE-L, f.i., is the invoice receipt.
If you click the material document number you will see the details of the goods receipt.
If you already know the material document number you can also use transaction MB03 or MIGO to display the material document. MIGO is only available from release 4.6 (I think).
In MB03 you fill in the material document and the document year.
In MIGO you need to select transactin A04 display and then you can enter the material document number.
Hope this helps.