[ADD] - new module Product Contract Variable Quantity

product_contract_variable_quantity/models/contract_line.py

@@ -0,0 +1,16 @@
+# Copyright 2017 LasLabs Inc.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+
+from odoo import api, fields, models
+
+
+class AccountAnalyticInvoiceLine(models.Model):
+    _inherit = 'account.analytic.invoice.line'
+
+    @api.onchange('product_id')
+    def onchange_product(self):
+        super(AccountAnalyticInvoiceLine, self).onchange_product()
+        if self.product_id.is_contract:
+            self.qty_type = self.product_id.qty_type
+            self.qty_formula_id = self.product_id.qty_formula_id