Unable to create Amendments using amendment API loader

[Baratwaaj]

Problem:
The customer is tried to create Amendments using Amendment API Loader in Developer tools. But they are facing the below error 
NO_PERMISSION: Subscription api cannot be used when order is enabled.

Answer: 
The following error message indicates that your tenant has the Orders feature enabled. Currently, when Orders are enabled, Subscribe/Amend APIs cannot be used. Hence the Amendment API Loader is not supported. 

You can instead try using Order API Loader. 
See Orders API Migration Guidance for more information.