This is a shady area in the travel policy. The policy clearly states that holding a confirmed space ticket AND a non-rev listing for the same flight is a violation of travel policy punishable by loss of travel benefits up to and including termination.
There is a lack of clarity in company statements about multiple bookings. On one hand the company says don't do this because it causes problems with load factor calculations, catering, etc. On the other, the company says that no seat is taken out of inventory (for non-rev travel) until a boarding pass is issued by the gate agent. (I know that when the company was attempting to cater F/C to the revenue load rather than to the cabin capacity, non-revs who got F/C at the last minute did not always get meals.)
I do know that the company tracks such things as--
1. You list and check-in for a flight as a D2 (let's say 24 hours prior to departure). You are departing from a hub (say DFW or ORD).
2. As the hours progress, you see D2Ts checking in who will be through passengers at the hub and will go ahead of you in priority.
3. You cancel your D2 listing, re-list and check-in as a D1. This is a BIG no-no. I know because I did it when I was commuting to STL, not knowing that it was illegal. When I got to the gate, the agent asked me if I was sure I wanted to use that D1 or go back to D2 status and take my original place in line. This particular agent let me know that it was a violation and she would have to report it, if I insisted on using the D1. I went back to D2. Didn't get on the flight, but I still have my job and my travel benefits. So, there is some ability to track booking history for non-revs--even cancelled listings.
After all, just as my father used to say when each of us got our driver's license..."Remember, as far as you are concerned, the law is what the cop on the beat says it is. If he is wrong, that's what courts and judges are for." Well, as far as most of us are concerned, the travel policy is what the agent at the gate says it is. If they refuse you boarding for a perceived violation of the travel policy, you might win in an appeal, but you still won't get to LA that day.
There is legal precedent that defines travel benefits as a granted, not an earned benefit. Technically, the company can change the policy at any time for any reason.
Given what E posted above about duplicate booking tracking software, my recommendation would be don't do it. If the need to be in Los Angeles is so great that you would risk your benefits and/or your job to get there, it is a need that calls for buying a confirmed space ticket.