[IMP] contract_price_revision: Improve compatibility with contract base module

Values for new line should come from _prepare_value_for_plan_successor function
adding the new price.

contract_price_revision/models/contract_line.py

@@ -47,3 +47,16 @@ class ContractLine(models.Model):
                 ) * 100
             else:
                 line.variation_percent = 0.0
+
+    def _prepare_value_for_plan_successor_price(
+        self, date_start, date_end, is_auto_renew, price, recurring_next_date=False
+    ):
+        """
+            Override contract function to prepare values for new contract line
+            adding the new price as parameter
+        """
+        res = super()._prepare_value_for_plan_successor(
+            date_start, date_end, is_auto_renew, recurring_next_date=recurring_next_date
+        )
+        res.update({"price_unit": price})
+        return res