ACR CHK PLT PULLS UP INBOUND CLRNC ON ACARS WHEN DEPARTING. FLIES WRONG CLRNC.

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INBOUND FLT WAS LATE AND WE WERE RUSHED BECAUSE OF THE 'SCHEDULED OUT TIME' RPT CARD MENTALITY. WE WERE DISPATCHED WITH THE R HAND FUEL TANK QUANTITY INOP (FIRST TIME IN 4 YRS FOR ME). I WAS REQUIRED TO VISUALLY OBSERVE THE STICKING OF THE FUEL TANK; WHICH TOOK MORE TIME. I WAS GIVING AN IOE TO A TRANSITION CAPT WHO HAS BEEN DOING A GOOD JOB. IN A RUSH TO GET OUT I PULLED UP THE CLRNC FROM ACARS; BUT THE CAPT HAD NOT SET UP THE ACARS FROM THE PREVIOUS FLT. A FLT PLAN CAME OUT SO I SET THE SQUAWK ON THE TRANSPONDER; CALLED CLRNC DELIVERY AND CONFIRMED THE SQUAWK; THEY SAID OK AND WE LEFT. THE CLRNC SAID; CLB TO 10000 FT. AFTER DEP I COULD NOT GET DEP CTL ON THE RADIO. FINALLY I CONTACTED THEM WHILE CLBING THROUGH ABOUT 6000 FOR 10000. IT TURNS OUT THAT THE CLRNC I GOT ON ACARS WAS FOR THE INBOUND FLT. THE SQUAWK WAS INCORRECT. THE ALT WAS WRONG AND SO WAS THE DEP FREQ. WE WERE SUPPOSED TO LEVEL AT 5000; I GUESS. IT WAS VMC; NO CONFLICTS. I SHOULD HAVE VERIFIED THAT THE ACARS CLRNC WAS FOR US. I DEPENDED TOO MUCH ON 'THE SYS' AND THE PERFORMANCE OF A NEW TRANSITION CAPT. I WILL BE MUCH MORE INVOLVED FROM NOW ON! POSSIBLE CHANGES: ONCE A FLT HAS DEPARTED (I.E.; ACARS 'OFF' RECORDED) THE COMPUTER COULD 'LOCK OUT' ANY OTHER REQUEST FOR THAT SPECIFIC FLT PLAN VIA ACARS. ALSO; IF SOMEONE CALLS CLRNC DELIVERY TO CONFIRM THE CORRECT SQUAWK RECEIVED VIA ACARS THEY SHOULD ALSO BE MORE INVOLVED; AND; IF THE INCORRECT SQUAWK IS RPTED; THIS SHOULD SENT UP A RED FLAG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THIS WAS A VERY RUSHED CHANGE OVER. THEY WERE TAKING OVER ACFT FROM PREVIOUS FLT. ACARS NORMALLY WILL PURGE ITSELF WITHIN 5 MINS OF FLT COMPLETION. RPTR CANNOT BELIEVE THEY TOOK LESS THAN 5 MINS FLT PREFLT PREPARATION. BECAUSE THEY WERE LATE; HE TOOK OUTSIDE AND TRANSITION CAPT TOOK INSIDE. RPTR FELT CAPT HAD BEEN DOING QUITE WELL. NO REASON TO DOUBT HIS CAPABILITY. CTLR NO HELP WHEN CONFIRMED WRONG SQUAWK. LATER DISCOVERED THE INBOUND FLT NUMBER STILL IN ACARS WHICH MAY BE WHAT TRIGGERED THE WRONG CLRNC. FEELS STRONGLY THERE SHOULD BE A LOCK OUT SYS SO THIS CANNOT HAPPEN.