RoyB wrote:
You don't need to wire it into a 50 AMP socket. They make 30A-50A adapters to do that with...

Just make sure you test the circuit using a multimeter and it must pass this test setup - NO DEVIATION...

Roy Ken
OK, so here is is the original diagram. In the upper right hand corner is a 50 amp breaker. The plug going into the 50 amp socket shows a direct short across the two wires going to the breaker. Those are hot leads going to two different legs.
EDIT. Remove that short and the diagram is right.
EDIT 2. That IS a 50 amp male with a short across the hot pins plugged into a 50 amp female.
EDIT 3 Are those breakers on the source side or the RV side? Normally you would show the source breaker/breakers and a receptical on the load side.