[IMP] mrp: warning message if unique serial numbers

When consuming products tracked by unique serial number, no check is
done on the quantity consumed for a given serial number. It means that
negative quants might be created without any warning to the user.

We implement a simple warning thanks to a onchange.

opw-687129

addons/mrp/i18n/mrp.pot

@@ -890,6 +890,12 @@ msgstr ""
 msgid "Is Follower"
 msgstr ""
 
+#. module: mrp
+#: code:addons/mrp/wizard/mrp_product_produce.py:127
+#, python-format
+msgid "Issue with lot quantity!"
+msgstr ""
+
 #. module: mrp
 #: model:ir.model.fields,help:mrp.field_mrp_routing_location_id
 msgid "Keep empty if you produce at the location where the finished products are needed.Set a location if you produce at a fixed location. This can be a partner location if you subcontract the manufacturing operations."
@@ -2215,6 +2221,12 @@ msgid "You can not delete a Bill of Material with running manufacturing orders.\
 "Please close or cancel it first."
 msgstr ""
 
+#. module: mrp
+#: code:addons/mrp/wizard/mrp_product_produce.py:128
+#, python-format
+msgid "You plan to consume more than 1.00 unit of product %s with unique lot number %s"
+msgstr ""
+
 #. module: mrp
 #: model:ir.ui.view,arch_db:mrp.view_mrp_product_template_form_inherited
 msgid "days"

addons/mrp/wizard/mrp_product_produce.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from openerp import api, _
 from openerp.osv import fields, osv
 import openerp.addons.decimal_precision as dp
 
@@ -104,3 +105,27 @@ class mrp_product_produce(osv.osv_memory):
         self.pool.get('mrp.production').action_produce(cr, uid, production_id,
                             data.product_qty, data.mode, data, context=context)
         return {}
+
+    @api.onchange('consume_lines')
+    def _onchange_consume_lines(self):
+        '''
+        The purpose of the method is to warn the user if we plan to consume more than one unit of
+        a product with unique serial number.
+        '''
+        for product in self.consume_lines.mapped('product_id'):
+            if product.tracking != 'serial':
+                continue
+
+            qty_by_lot = {}
+            lines = self.consume_lines.filtered(lambda r: r.product_id == product)
+            for line in lines:
+                qty_by_lot.setdefault(line.lot_id, 0.0)
+                qty_by_lot[line.lot_id] += line.product_qty
+
+                if qty_by_lot[line.lot_id] > 1.0:
+                    warning_mess = {
+                        'title': _('Issue with lot quantity!'),
+                        'message' : _('You plan to consume more than 1.00 unit of product %s with unique lot number %s') % \
+                            (product.name, line.lot_id.name)
+                    }
+                    return {'warning': warning_mess}