Actual Resettlement Officers (IEROs) are not serving officers, some are retired officers. So if someone in green tells you you cant do a course, its not their call to make. Speak to the IERO.
Resettlement is the service leavers responsibility, if you cant be bothered to sort it or are put of when someone says they 'dont think' that you can do it, then its your loss. Its a step in the direction of civvie street, where youll have to make your own decisions.
Obviousley your course provider choices are limited when it comes to using your ELC, but make you decision and stick with it, of course be prepared to write a supporting letter if the course you want is abroad or if CTP do the same course but not in the area that you want.