[FIX] purchase: Only use purchase UOM on vendor bill

It was the purpose of this commit fea667a2433dfc2387daa7051989e840d30e18e0
However it uses purchase uom in any cases and not
only vendor bill.

This commit correct it by using it only if a purchase
order is linked to the invoice.

2 files changed, 7 insertions, 3 deletions

diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 93951e68904..83a4c015179 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -1316,9 +1316,6 @@ class AccountInvoiceLine(models.Model):
                 self.price_unit = 0.0
             domain['uom_id'] = []
         else:
-            # Use the purchase uom by default
-            self.uom_id = self.product_id.uom_po_id
-
             if part.lang:
                 product = self.product_id.with_context(lang=part.lang)
             else:
diff --git a/addons/purchase/models/account_invoice.py b/addons/purchase/models/account_invoice.py
index 0aed9c09c26..43ffb17dddf 100644
--- a/addons/purchase/models/account_invoice.py
+++ b/addons/purchase/models/account_invoice.py
@@ -59,6 +59,13 @@ class AccountInvoice(models.Model):
             data['account_id'] = account.id
         return data
 
+    def _onchange_product_id(self):
+        domain = super(AccountInvoice, self)._onchange_product_id()
+        if self.purchase_id:
+            # Use the purchase uom by default
+            self.uom_id = self.product_id.uom_po_id
+        return domain
+
     # Load all unsold PO lines
     @api.onchange('purchase_id')
     def purchase_order_change(self):