Attempting to export a project using the UI Action 'Export to MS Project' while using any Schedule that is not the Project Management Schedule or the Default MS Project schedule will result in an error with the message:
Exporting Projects with out "Default MS Project/Project Management Schedule" is not supported.
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In order to export projects, users who have access must click the UI Action, 'Export to MS Project'.
The 'Export to MS Project' uses a condition that checks to see if the linked project schedule is Default MS Project or Project Management Schedule via hardcoded sys_id:
gs.hasRole("project_manager") && (current.schedule == "f7c7d3a60a0a0b6500cc36babf981351" || current.schedule =="7aa3e10c8f70010040f82ab2f0f9234d")
This is expected behavior. If you update the UI Action 'Export to MS Project' so that the condition passes for any other Project Schedule, the system will abort the action of exporting the project and display the following message: Exporting Projects with out "Default MS Project/Project Management Schedule" is not supported