In order to attach a document, you must have the new Visual Version in your Control Panel. You must also have previously created the document since this transaction is done in the Change Purchase Requisition transaction (ME52N).
Step 1: Enter transaction code ME52N in the transaction window. Your screen will look similar to the one below.

Step 2: Click on the Service for Object button and a drop down menu will appear. Select Create > Create Attachment from the menu as shown below.

Step 3: The next window allows you to select where the file in located. Highlight the file and click on the open button to attach it.
NOTE: If an error message occurs click OK and the system will forward you to your directory of files.

Note: You will not receive a confirmation that the file has been attached. To check that the file is attached, in transaction ME52N click on the Services for Object button. From the menu select Choose Attachment List and a list of the attached documents will display.