Solution : https://service.sap.com/sap/support/notes/530390 (SAP Service marketplace login required)
Key words : 
purchase order items 0bbp_aspvoc - purchase order, purchase order currency 0bbp_aspqou - order quantity, 0bbp_limit - net limit 0bbp_poct - number, order unit 0bbp_polimo  additional limit, 0bbp_expval - expected net purchase order, purchase orders 0bbp_poitms - number, expected purchase order, purchase order currency, entire purchase order, update purchase orders
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