MSC understands 112 as emergency call because MS sends CM SERVICE REQUEST message to the network with a CM service type information element indicating emergency call establishment (no digits are sent from MS).
There is no need to define 112 in normal or default preanalisis. Emergency call indication is always handled as service type 0. So, in the command group RU – AREA SERVICE NUMBER HANDLING – you can create real service number with service type 0 with corresponding routing.
Also check in NED parameter 002:0844.