Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural MEL / CDL; Ground Event / Encounter Fuel Issue
General Flight Cancelled / Delayed; General Maintenance Action
MEL; Human Factors; Aircraft; Procedure
Aircraft X; a B777; arrived with the Center Tank RH Refuel Valve stuck open.  I was instructed by the OAL (Other Air Line) Maintenance Manager to apply the MEL.  I then contacted OAL Maintenance via [software program] and was instructed to apply MEL XX-XX-XX-XXB Pressure Fueling System Refuel Valves Refuel Valve open; with Derivative MEL XX-XY-XX-XX Fuel Jettison System With New Scavenge System; and Derivative MEL XX-XY-XZ Fuel Scavenge Systems. I applied these 3 MELs as instructed and found out 2 days later from Company local management that MEL XX-XX-XX-XXB does not apply to the Center fuel Tank; only the Left Main and Right Main fuel tanks.
Technician reported aircraft departed with three MELs applied and was informed that one MEL was not valid and misapplied.