Sync secondary unit on supplier and internal shipments

When synchronize the outgoing or incoming move, the secondary unit must be
copied from the template.

Closes #12301
(grafted from b190ea97bd1a2040686ed6c9565ac20c45c529f4)

--HG--
branch : 6.0

modules/stock_secondary_unit/__init__.py

@@ -13,4 +13,5 @@ def register():
         stock.ShipmentIn,
         stock.ShipmentOut,
         stock.ShipmentOutReturn,
+        stock.ShipmentInternal,
         module='stock_secondary_unit', type_='model')

modules/stock_secondary_unit/stock.py

@@ -153,6 +153,12 @@ class ShipmentOut(metaclass=PoolMeta):
             inventory_move.secondary_unit = move.secondary_unit
         return inventory_move
 
+    def _sync_outgoing_move(self, template=None):
+        move = super()._sync_outgoing_move(template)
+        if template:
+            move.secondary_unit = template.secondary_unit
+        return move
+
 
 class ShipmentOutReturn(metaclass=PoolMeta):
     __name__ = 'stock.shipment.out.return'
@@ -162,3 +168,13 @@ class ShipmentOutReturn(metaclass=PoolMeta):
         if move:
             move.secondary_unit = incoming_move.secondary_unit
         return move
+
+
+class ShipmentInternal(metaclass=PoolMeta):
+    __name__ = 'stock.shipment.internal'
+
+    def _sync_incoming_move(self, template=None):
+        move = super()._sync_incoming_move(template)
+        if template:
+            move.secondary_unit = template.secondary_unit
+        return move