FIX agreement_sale: oca remarks

agreement_sale/__manifest__.py

@@ -11,7 +11,7 @@
     'website': 'https://github.com/oca/contract',
     'license': 'AGPL-3',
     'depends': [
-        'sale',
+        'sale_management',
         'agreement',
     ],
     'data': [

agreement_sale/models/sale.py

@@ -10,5 +10,5 @@ class SaleOrder(models.Model):
 
     agreement_id = fields.Many2one(
         comodel_name='agreement', string='Agreement', ondelete='restrict',
-        track_visibility='onchange', readonly=True,
+        track_visibility='onchange', readonly=True, copy=False,
         states={'draft': [('readonly', False)], 'sent': [('readonly', False)]})