ZOB CTLR ISSUED CLB CLRNC TO AN LR25 THROUGH THE ALT OF A BA146 BASED ON CONFLICTING DATA STRIP AND HOST COMPUTER RTE READOUT DATA. CTRL BELIEVES THAT HE SHOULD NOT HAVE TO RESOLVE THESE TYPE INFO CONFLICTS IN ORDER TO SEPARATE ACFT.

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THE LEARJET; CLBING S OUT OF TORONTO; LEVELED AT FL270. THE BA146; BUF TO YQO; WAS IN LEVEL FLT AT FL280. THE LEARJET FILED THORL DKK EWC. THE COMPUTER PRINTED OUT SOME PREFERENTIAL ROUTING TO THE SECTOR BENEATH ME; THORL EWC; WHICH IS APPROX A 195 DEG HDG OUT OF THORL. THE WAY THE COMPUTER IS SET UP; THE SECTOR BENEATH ME GETS PREFERENTIAL ROUTING ON A STRIP WHICH THE CTLR IS SUPPOSED TO ISSUE. THE COMPUTER ASSUMES THIS TO BE DONE. MY STRIP ON THE ACFT SAYS ONLY THORL EWC. I HAD NO IDEA IT WAS FILED ANY OTHER WAY. BASED ON MY INFO; THE LEARJET AND BA146 WERE NOT TFC; SO I CLBED THE LEARJET FROM FL270 TO FL290. IMMEDIATELY THEREAFTER; I SAW THE LEAR START TO TURN SE; INTO THE BA146. I ASKED HIM IF HE WAS TURNING OVER DKK; HE SAID YES; AND I CLRED HIM BACK TO FL270. THE DATA BLOCK INDICATED FL270 AT THIS TIME. NEXT HIT WAS FL274; THEN NEXT HIT WAS FL279. I CALLED TFC TO THE LEAR AND TOLD HIM TO RPT FL270. THE BA146 HAD A TCASII RA AND CLBED TO FL290; AND I TURNED THE BA146 30 DEGS R. THE LEAR 'PULLED G'S' GETTING BACK TO FL270; AND AN ERROR WAS NARROWLY AVERTED. I HAVE GRAVE MISGIVINGS ABOUT THE COMPUTER CHANGING RTE INFO REGARDLESS OF IF IT WAS ACCOMPLISHED. THIS IS CLRLY UNSAFE AND CONTRARY TO OUR MISSION OF SAFETY FIRST.