AN AIRBUS 319 WAS DISPATCHED WITH THE INCORRECT DEFERRAL PROC FOR A XFER VALVE FAILURE. CONTRACT TECHNICIAN FAILED TO ACCOMPLISH MEL SPECIAL PROCS.

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ACFT ARRIVED IN DCA WITH AN OPEN LOGBOOK WRITE-UP ON THE L AND R FUEL XFER VALVES. CONTRACT MECH WAS IN OPS AT THE TIME RECEIVING INSTRUCTIONS FROM MAINT TO FIX/DEFER THE WRITE-UP. WE PROCEEDED TO THE ACFT. THE FUELING PROCESS WAS COMPLETED AND THE MECH ARRIVED IN THE COCKPIT WITH A MAINT PROC LIST THAT REQUIRED PULLING AND RESETTING CIRCUIT BREAKERS TO LOCK THE VALVES IN THE OPEN POS. THE MECH DID NOT PERFORM THESE STEPS. HE LEFT THE COCKPIT AFTER HANDING US THE MEL AND SAID THE PROB WOULD BE SIGNED OFF BY MAINT. I READ THE MEL PROC LIST AT THAT TIME AND AFTER LOOKING AT THE VALVE POS INDICATORS ON THE FUEL PAGE; REALIZED THAT NONE OF THIS WORK HAD ACTUALLY BEEN ACCOMPLISHED. AT THIS TIME I SENT AN ACARS MESSAGE TO MAINT ASKING IF HE WANTED US TO PERFORM THE PROC. WE RECEIVED A REPLY 'YES; OPEN CIRCUIT BREAKERS UNTIL VALVES OPEN THEN AFTER APPROX 30 SECONDS CLOSE CIRCUIT BREAKERS. VALVE WILL STAY OPEN AND DISPLAY GREEN.' WE DID; AND AFTER THE VALVES WERE LOCKED OPEN; WE SENT ANOTHER MESSAGE TO MAINT ASKING FOR THE DEFERRAL. WE RECEIVED A RESPONSE 'FBO GND CHKED AND NO DEFERRAL ENTERED. SHOULD HAVE ZZZ1 XA25Z WHICH IS CORRECT.' THIS WAS THE CORRECT ORIGINAL MAINT RELEASE; SO WE CONFIRMED THE PROB HAD BEEN SIGNED OFF AND NO DEFERRAL STICKER OR NEW RELEASE WAS REQUIRED. WE PROCEEDED TO PUSH BACK AND TAXI OUT FOR TKOF. ALL FUEL INDICATIONS WERE IN ACCORDANCE WITH THE MEL PLACARD. APPROX 5 MINS AFTER TKOF; A NEW RELEASE WITH A DEFERRAL NUMBER CAME ACROSS OUR PRINTER. RIGHT AFTER THAT; A NEW RELEASE FLT PLAN WITH THE FUEL XFER VALVE MEL CAME ACROSS OUR PRINTER. OBVIOUSLY; THIS CAUGHT OUR ATTN BECAUSE DESPITE OUR BEST EFFORTS TO HAVE THE APPROPRIATE MAINT PAPERWORK IN ORDER; WE HAD JUST TAKEN OFF WITH AN INVALID RELEASE. WE IMMEDIATELY CONTACTED OUR DISPATCH AND TRIED TO FIND OUT WHAT HAPPENED. WE AGREED TO HAVE A CONFERENCE CALL WITH MAINT UPON ARR IN ZZZ2. AFTER ARRIVING; CALLED DISPATCH AND HE SET UP A CONFERENCE CALL WITH MR X. HE INFORMED US THAT HE HAD INADVERTENTLY ENTERED THE WRONG CODE THAT ESSENTIALLY SIGNED OFF THE ITEM AS BEING FIXED. WHEN WE SENT THE ACARS MESSAGE ASKING FOR THE DEFERRAL; HE REALIZED THE MISTAKE THAT HAD BEEN MADE AND PROCEEDED TO CORRECT IT IN THE COMPUTER. WE WERE NOT NOTIFIED PRIOR TO TKOF AND DID NOT RECEIVE THE NEW RELEASE UNTIL AFTER TKOF. OBVIOUSLY; DISPATCH RECEIVED THE CORRECTION AT THE SAME TIME AND SENT RELEASE THAT WAS ALSO RECEIVED ONCE AIRBORNE. PART OF THE CONFUSION CAME FROM RECEIVING MESSAGES FROM BOTH. WE WRONGLY ASSUMED THAT BOTH OF THESE FACILITIES WERE COMMUNICATING WITH EACH OTHER. OUR DISPATCHER INFORMED US THAT HE WOULD BE FILING A RPT SO WE ALSO NOTIFIED HIM AND MR X THAT WE WOULD BE FILING THIS RPT.