AT ENRTE STOP OF MLG; FLT WAS CANCELED BECAUSE OF INFO THAT NIGHT NAV WING TIP WHITE LIGHT L WING WAS OUT.

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RPTED TO ACFT 35 MIN PRIOR TO DEP. 1 MAINT ITEM IN LOGBOOK CARRIED OVER; 'R WING GREEN NAV LIGHT OUT.' FO RPTED DISCUSSION WITH MAINT PERSONNEL ON WALK AROUND REVEALED 1 (OF 2?) LIGHTS IN R WING TIP WAS OUT AND ENTIRE ASSEMBLY WOULD HAVE TO BE REPLACED AT DOWNLINE STATION. MEL STATED GREEN LIGHT ON R WINGTIP REQUIRED FOR NIGHT OPS. AT ENRTE STOP; FLT CTL CALLED CAPT (ME) TO OPS AND SAID OP WAS NOT LEGAL. HIS INFO WAS THAT L WINGTIP WHITE LIGHT WAS INOP. HE WAS CANCELLING REMAINDER OF FLT AND FLAG STOPPING ANOTHER ACFT TO ACCOMMODATE OUR (FEW) PAX. I TOLD HIM I HAD JUST WALKED AROUND THE ACFT AND WE HAD NAV LIGHTS BURNING AT EVERY POS. STILL CONCERNED ABOUT THE WRITEUP AND UNWILLING TO REVERSE COURSE ON EVENTS HE PUT IN MOTION; FLT WAS CANCELLED. SINCE I HAD BEEN CONCERNED ABOUT WX AT OUR ORIGINAL DEP STATION; THE LIGHT SITUATION WAS RESOLVED AND PUT AWAY IN MY MIND. PERHAPS THE MAINT IRREGULARITY ENTERED IN THE LOGBOOK WAS NOT SPECIFIC ENOUGH TO DESCRIBE THE SITUATION AS IT ACTUALLY WAS. CERTAINLY; ERRONEOUS INFO WAS PASSED TO COMPANY MAINT AND FLT CTL. I DO NOT BELIEVE THE FLT WAS OPERATED ILLEGALLY; HOWEVER; IN THE FUTURE I WILL PAY GREATER ATTN TO MAINT CARRY-OVER ITEMS.