PDC CONFUSION. AMENDED SECTION OF ROUTING MISSED.

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ON CLBOUT OUT OF CLT ON THE HORNET 6 SID WE WERE HANDED OVER TO ZTL FROM CLT DEP. AFTER CHKING IN; THE CTR GAVE US A HIGHER ALT AND TOLD US TO PROCEED DIRECT TO 'ATL' REST OF RTE UNCHANGED. A QUICK CHK OF OUR RTE SHOWED THAT WE WERE NOT GOING OVER 'ATL.' SO WE TOLD ZTL WE WERE NOT FILED THAT WAY. OF COURSE; HE ASKED US HOW WE WERE FILED; WHICH WE TOLD HIM. AT THAT POINT HE CHANGED OUR CLRNC TO 'ATL-VUZ AS PREVIOUSLY CLRED.' SINCE WE HAD NOT REACHED THE 'HARAY' INTXN ON THE CHARLOTTE SID WE WERE NEVER OFF COURSE; BUT WOULD HAVE BEEN HAD WE NOT BEEN GIVEN A CHANGE UPON CHK-IN. THE CONFUSION I FEEL RESULTED FROM THE DISPLAY ON OUR ACARS SCREEN. SINCE OUR COMPANY FILED RTE SHOWED 'CLT HARAY ODF VUZ J52 DFW J4 ABI J66 EWM J4 SAN' I ASSUMED THE 'HARAY SPA J14 ATL VUZ' PART WAS A MISTAKE SINCE IT WAS NOT COMPLETE. MY THOUGHTS AND RESOLUTIONS: IT WOULD BE HELPFUL TO PUT 'AMDT' OR SOMETHING SIMILAR IF THE RTE IS AMENDED ON THE SCREEN. IT ALSO WOULD BE NICE IF THEY KNOW THEY ARE AMENDING THE RTE; NOT TO INCLUDE ANY OTHER UNNECESSARY RTES ON THE SAME SCREEN. I SHOULD HAVE CALLED CLRNC BY VOICE AND VERIFIED THE RTE INSTEAD OF ASSUMING THEY HAD MADE A MISTAKE.