[IMP] contract: Add display sequence on contract lines (#119)

contract/models/account_analytic_invoice_line.py

@@ -14,6 +14,7 @@ from odoo.tools.translate import _
 
 class AccountAnalyticInvoiceLine(models.Model):
     _name = 'account.analytic.invoice.line'
+    _order = "sequence,id"
 
     product_id = fields.Many2one(
         'product.product',
@@ -54,6 +55,11 @@ class AccountAnalyticInvoiceLine(models.Model):
         help='Discount that is applied in generated invoices.'
              ' It should be less or equal to 100',
     )
+    sequence = fields.Integer(
+        string="Sequence",
+        default=10,
+        help="Sequence of the contract line when displaying contracts",
+    )
 
     @api.multi
     @api.depends('quantity', 'price_unit', 'discount')