'Error 501 - Not implemented' occurs when copying from a template using the Actions Menu if there is a custom date field on the project that requires validation using today's date. This prevents the template team and tasks from copying over to the target template.
CA PPM 14.2, 14.3, 14.4
Due to defect DE29510 or CLRT-81309
The development team has reviewed the scenario and confirmed that this cannot be fixed at this moment.