Set empty currency and unit price on stock move when not required

Closes #14023
(grafted from 6090f9c621e782cd47eb0537dee972c2f1fa8fe6)

--HG--
branch : 7.0

modules/product_kit/purchase.py

@@ -114,6 +114,9 @@ class LineComponent(
             move.unit_price = round_price(
                 self.line.unit_price * self.price_ratio)
             move.currency = self.line.purchase.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         move.planned_date = self.line.planned_delivery_date
         move.origin = self
         move.origin_planned_date = move.planned_date

modules/product_kit/sale.py

@@ -111,6 +111,9 @@ class LineComponent(
             move.unit_price = round_price(
                 self.line.unit_price * self.price_ratio)
             move.currency = self.line.sale.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         move.planned_date = self.line.planned_shipping_date
         move.origin = self
         move.origin_planned_date = move.planned_date

modules/purchase/purchase.py

@@ -1840,6 +1840,9 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
         if move.on_change_with_unit_price_required():
             move.unit_price = self.unit_price
             move.currency = self.purchase.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         move.planned_date = self.planned_delivery_date
         move.invoice_lines = self._get_move_invoice_lines(move_type)
         move.origin = self

modules/sale/sale.py

@@ -1869,6 +1869,9 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
         if move.on_change_with_unit_price_required():
             move.unit_price = self.unit_price
             move.currency = self.sale.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         move.planned_date = self.planned_shipping_date
         move.invoice_lines = self._get_move_invoice_lines(shipment_type)
         move.origin = self

modules/sale_supply_drop_shipment/stock.py

@@ -426,6 +426,9 @@ class ShipmentDrop(
             else:
                 move.unit_price = 0
                 move.currency = self.company.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         return move
 
     @classmethod

modules/stock/shipment.py

@@ -1518,6 +1518,9 @@ class ShipmentOut(
         if inventory_move.on_change_with_unit_price_required():
             inventory_move.unit_price = move.unit_price
             inventory_move.currency = move.currency
+        else:
+            inventory_move.unit_price = None
+            inventory_move.currency = None
         return inventory_move
 
     @classmethod
@@ -1600,6 +1603,9 @@ class ShipmentOut(
             else:
                 move.unit_price = 0
                 move.currency = self.company.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         return move
 
     @classmethod
@@ -2682,6 +2688,9 @@ class ShipmentInternal(
             else:
                 move.unit_price = 0
                 move.currency = self.company.currency
+        else:
+            move.unit_price = None
+            move.currency = None
         return move
 
     @classmethod