Display lot of counted inventory line

Closes #13083

modules/stock_lot/__init__.py

@@ -29,6 +29,7 @@ def register():
         stock.Inventory,
         stock.InventoryLine,
         stock.InventoryCountSearch,
+        stock.InventoryCountQuantity,
         product.Configuration,
         product.ConfigurationDefaultLotSequence,
         product.Template,

modules/stock_lot/stock.py

@@ -888,6 +888,7 @@ class InventoryCount(metaclass=PoolMeta):
     def default_quantity(self, fields):
         pool = Pool()
         Product = pool.get('product.product')
+        InventoryLine = pool.get('stock.inventory.line')
         inventory = self.record
         if isinstance(self.search.search, Product):
             product = self.search.search
@@ -896,7 +897,10 @@ class InventoryCount(metaclass=PoolMeta):
                 raise RequiredValidationError(
                     gettext('stock_lot.msg_only_lot',
                         product=product.rec_name))
-        return super(InventoryCount, self).default_quantity(fields)
+        values = super(InventoryCount, self).default_quantity(fields)
+        line = InventoryLine(values['line'])
+        values['lot'] = line.lot.id if line.lot else None
+        return values
 
     def get_line_domain(self, inventory):
         pool = Pool()
@@ -924,3 +928,12 @@ class InventoryCountSearch(metaclass=PoolMeta):
     def __setup__(cls):
         super(InventoryCountSearch, cls).__setup__()
         cls.search.selection.append(('stock.lot', "Lot"))
+
+
+class InventoryCountQuantity(ModelView):
+    __name__ = 'stock.inventory.count.quantity'
+
+    lot = fields.Many2One('stock.lot', "Lot", readonly=True,
+        states={
+            'invisible': ~Eval('lot', None),
+            })

modules/stock_lot/stock.xml

@@ -417,5 +417,11 @@ this repository contains the full copyright notices and license terms. -->
             <field name="name">inventory_line_tree</field>
         </record>
 
+        <record model="ir.ui.view" id="inventory_count_quantity_view_form">
+            <field name="model">stock.inventory.count.quantity</field>
+            <field name="inherit" ref="stock.inventory_count_quantity_view_form"/>
+            <field name="name">inventory_count_quantity_form</field>
+        </record>
+
     </data>
 </tryton>

modules/stock_lot/view/inventory_count_quantity_form.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<data>
+    <xpath expr="/form/field[@name='product']" position="after">
+        <label name="lot"/>
+        <field name="lot"/>
+    </xpath>
+</data>