I set up terminal gate parking and proceeded with terminal modeling. Whenever I checked how things looked in FSX, there was an American Eagle aircraft at the gate containing parking code EGF. After noticing that the terminal building model conflicted with the push-back vehicle location for this parking space, I moved the parking space requiring removing links and reattaching them in the new location. Now the American Eagle aircraft will not use this space and instead parks at another gate with no parking codes. I checked the new links to the EGF coded gate and found everything connected. What could I have done to this parking space to have made it unusable?