[FIX] product: pricelist based on supplier price

In the case of a purchase pricelist based on the supplier price, the
price selected is incorrect if the supplier is not in the list of
suppliers of the product. Indeed, in this case, the price of the first
supplier is chosen.

We also need to make sure to go through all the pricelist items found.

opw-678440

addons/product/pricelist.py

@@ -312,7 +312,8 @@ class product_pricelist(osv.osv):
                         if (not partner) or (seller_id.name.id != partner):
                             continue
                         seller = seller_id
-                    if not seller and product.seller_ids:
+                    # DO NOT FORWARDPORT
+                    if not seller and product.seller_ids and rule.price_version_id.pricelist_id.type == 'sale':
                         seller = product.seller_ids[0]
                     if seller:
                         qty_in_seller_uom = qty
@@ -359,7 +360,7 @@ class product_pricelist(osv.osv):
                         price = min(price, price_limit + price_max_margin)
 
                     rule_id = rule.id
-                break
+                    break
 
             # Final price conversion to target UoM
             price = product_uom_obj._compute_price(cr, uid, price_uom_id, price, qty_uom_id)