Airbus 318/319/320/321 Undifferentiated
Flight Crew Last 90 Days 100; Flight Crew Total 15000; Flight Crew Type 5000
Training / Qualification; Distraction; Confusion
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
General None Reported / Taken
Chart Or Publication; Procedure; Company Policy
We downloaded via datalink our route per the new Sabre flight plan. When we received our clearance by radio from MEX clearance delivery; it was slightly different from what we were filed. We were filed APN UJ15 TAM J177.... We were cleared BETER4 departure to BETER then as filed (which is what was read back). During climbout; after passing BETER; ATC asked if we were proceeding direct TAM. We responded we were proceeding to XOSOX; UJ15 to TAM. Nothing else was said by ATC; but we thought is was a strange question; so we looked back at the departure; and noted that BETER intersection is not on UJ15. We concluded that we possibly should have joined J177 at BETER and proceeded via J177 to TAM. I think a combination of Clearance Delivery ambiguity and non-standard delivery may have lead to the confusion. Also; the fact that we were having additional trouble obtaining revised Takeoff Data via ACARS; may have lead to the distraction of not entering the correct routing.
We were unable to gain access to operations in MEX. The SABRE flight plan was delivered to us by station personal. I used the local internet connection to access WSI for graphical weather information. We entered the BETER 4 departure into the FMGC and it changed the route to 'VISOS BETER UJ15 XOSOK TAM J177 PSX.' We both checked the route and it looked correct.  This was only my second flight with the new SABRE flight plan and the training on how to use this flight plan was very minimal and not timely (there were two months between my training date and the SABRE Flight plan turn on date). Confusion over this new flight plan; how it is depicted; and how it is downloaded into the FMGC contributed to this navigation error.
An Airbus crew new to the SABRE format; misread a SABRE flight plan FMGC presentation and after departing MEX. They had a track deviation because they failed to recognized a difference in the Clearance Delivery routing.