Attachment in Purchase Order Receipts after the receipts have been created

Hello,

Is there a way to attach documents/pdf to a Purchase Order Receipt after it has been received. We did come across a note on Metalink which says

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Once an attachment has been added to a receipt, it cannot be deleted.

One can upload new attachments to an existing receipt. This is possible through the Add To Receipt functionality in warehouse operations receiving.
Using warehouse operations receipts, user can create a receipt to attach a file. Then the user can add another line to the same receipt and then add
another file. This addition of new attachments is available only within warehouse receiving and not self service receiving (where you always create a