I have used the msfslegacyimporter tool to transfer a plane to MSFS from FSX X and I observe that PBE does nothing. 
Obviously this transfer did not include the files necessary for PBE to work. 
What files are required for PBE to work?

What plane are you trying to transfer?

The problem might be that it's using a custom variable for the parking brake rather than stock variable.

Beyond that though, porting FSX planes into MSFS sounds dicey.

It's sound dicey but I have to do a sim for a doc about the crash of a Comet IV in Barcelona in 1970. I see your answer it's not a solution.

Well, you're in test pilot territory with that FSX exporter... are you sure the parking brake was physically on / off?  

In voice control, it needs to be on / off for the voice command to trigger the next step.

Try it in button control.

 

 

I have not explained well. The pushback works but without services, which do not appear. 
There is no tug. Jetaways not working, etc.

Remember Pushback only triggers what's physically available at your parking spot.

If there's no catering truck there, for example, and and you try to trigger the catering truck nothing will come.

Same thing with the baggage carts, etc.