Also change order cannot be deleted/edited/un-approved to fix price change issue. Once a contract is agreed on, we would use internals to make sure costing is correct for any add/deducts that the customer wouldn’t see. We would be using external change orders to modify the contracted price of the project, which the customer would have to approve.
We have a project setting
“Mark added items as Non Billable on internal change orders”. You can mark that True.
When items are added to internal CO they are marked Non Billable and will not impact price.