[IMP] - get contract line default data onchange product_id

product_contract_variable_quantity/models/contract_line.py

@@ -9,8 +9,10 @@ class AccountAnalyticInvoiceLine(models.Model):
     _inherit = 'account.analytic.invoice.line'
 
     @api.onchange('product_id')
-    def onchange_product(self):
-        super(AccountAnalyticInvoiceLine, self).onchange_product()
+    def _onchange_product_id_recurring_info(self):
+        super(
+            AccountAnalyticInvoiceLine, self
+        )._onchange_product_id_recurring_info()
         if self.product_id.is_contract:
             self.qty_type = self.product_id.qty_type
             self.qty_formula_id = self.product_id.qty_formula_id

product_contract_variable_quantity/models/sale_order_line.py

@@ -32,9 +32,11 @@ class SaleOrderLine(models.Model):
                 rec.qty_formula_id = rec.product_id.qty_formula_id
 
     @api.multi
-    def _prepare_contract_line_values(self, contract):
+    def _prepare_contract_line_values(
+        self, contract, predecessor_contract_line=False
+    ):
         values = super(SaleOrderLine, self)._prepare_contract_line_values(
-            contract
+            contract, predecessor_contract_line
         )
         values['qty_type'] = self.qty_type
         values['qty_formula_id'] = self.qty_formula_id.id