Case
Getting an error in order approval process, attaching screen shot for your further reference:
Solution
If you tried to apply changes to the order approval version of a built-in bpm'online process, please note that it was created earlier than the [Approval] element appeared in bpm'online and you got the opportunity to enable it in any section.
As you can see, this process does not have such element and the implementation logic of it is totally different from the approval processes that can be created now.
If you want to modify the out-of-the-box order approval process and use it, please create a new one by using the [Approval] element.
After that go to System designer -> System settings -> Order approval process and specify your custom process in the setting:
