Maximum number of receipts against a PO

Does anyone know what the maximum number of receipts against a PO is? I have a client that sets up blanket type annual PO's, and will do multiple (possibly hundreds) of receipts against that PO during the year. I need to know if there is a max.

I came across 70000 receipts against a PO and worked fine. Problem was AP trying to match and had issues. Dont think there is a max on the receipts. Log with Denver see what they say.