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Environment/Versions TTworkbench, Windows, Linux, 32/64bit Answer // pre-definition type component MtcType { port MtcPortType mtcPort } type component SystemType { port SystemPortType systemPort } Until the standard of ES 201 873-1 v4.5.1, you can only define behaviour function running on a component type, but not against which TSI. Therefore no mapping can be used in a behaviour. Since ES 201 873-1 v4.6.1, you can specify also MTC and TSI type for behaviour function, like // recommended function myFunction() runs on MtcType mtc MtcType system SystemType { map (mtc:mtcPort,  system: systemPort); }