AN AIRBUS 320 DECLARED AN EMER AND DIVERTED DUE TO ILLOGICAL ECAM WARNING 'SMOKE DISCHARGE 2' WITH NO ECAM FIRE OR SMOKE WARNING.

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AT CREW LEVEL ON FLT ZZZ TO ZZZ1 CREW SAW AMBER CAUTION AND CHIME ECAM MESSAGE 'SMOKE DISCHARGE 2.' NO FIRE WARNING OR SMOKE WARNING. ECAM DID NOT SEEM APPROPRIATE; SO CREW FURTHER ANALYZED SIT USING FLT HANDBOOK; MAINT DISPATCH AND CARGO SMOKE TEST. CARGO FIRE DETECTION SYS RPT INDICATED BOTTLE #1 LOW PRESSURE -- LOGICAL. FLT ATTENDANT RPTED A CHEMICAL SMELL AT R17 (BOTTLE DISCHARGE??). DECLARED EMER WITH ZZZ CTR AS WE INFORMED DISPATCH AND MAINT LNDG ZZZ2. CAPT LANDED OVERWT AS FO RPTED 100 FPM JUST BEFORE TOUCHDOWN. EMER EQUIP RPT NO SMOKE. DEPLANED AT GATE. POST FLT INSPECTION; NO BOTTLE DISCHARGE. DEFERRED PER MAINT. ENRTE; CAPT REALIZED OVERWT INSPECTION HAD NOT BEEN ACCOMPLISHED BY CONTRACT MAINT. INFORMED MAINT AND WROTE IN BOOK INBOUND ZZZ1. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AMBER CAUTION AND ECAM MESSAGE 'SMOKE DISCHARGE 2' WAS NOT LOGICAL AS A CARGO COMPARTMENT FIRE OR SMOKE WARNING WOULD PRECEDE THE BOTTLE DISCHARGE. THE RPTR SAID WITH THIS WARNING AND THE CABIN ATTENDANT RPTING A CHEMICAL ODOR; AN EMER AND DIVERSION WAS IN ORDER. THE RPTR STATED WHEN THE CABIN ATTENDANT WAS INTERVIEWED; IT WAS QUESTIONABLE THAT A CHEMICAL ODOR WAS IN FACT SMELLED. THE RPTR STATED; WHEN ON THE GND; THE CONTRACT TECHNICIANS WERE VERY THOROUGH AND FOUND NO CARGO COMPARTMENT FIRE EXTINGUISHER BOTTLES DISCHARGED. THE RPTR SAID THE FALSE BOTTLE DISCHARGE WARNING WAS DEFERRED PER THE MEL.