What was found
AIRCRAFT WAS GROUNDED: FUEL F. USED/FOB DISAGREE ECAM AT CRUISE. PERFORMED QRH FUEL LEAK PROCEDURE. COULD NOT DEFINITIVELY CONFIRM OR DENY A FUEL LEAK. LEFT INNER WING TANK QUANTITY WAS GOING DOWN FASTER BUT FF, FUEL USED, AND ARRIVAL FUEL INDICATIONS WERE CLOSE TO NORMAL. DECESION MADE TO DIVERT TO CLT, EMERGENCY DECLARED AIRCRAFT LAMNDED WITHOUT INCIDENT. MAINTENANCE COMPLIED WITH TSM TASK 28-11-00-810-818 FUEL F. USED/FOB DISAGREE MESSAGES. ACCOMPLISHED FQIC TEST AND CONFIRMED FUEL QUANTITY IS NOT FLUCTUATING.