Comments
An FMU could be of the type Model Exchange (ME) or Co-simulation (CS) or both. An ME FMU contains the necessary states and variables that could be solved by the calling solver. A CS FMU can contain its own solver or calls another solver. In this case, two solvers co-simulate (one calling solver and other solving the FMU) to solve the entire model. An FMU may contain both modes ME and CS. In this case, the Type attribute in the FMU panel will be editable and you can select the mode in which the FMU is solved.

See the following for additional information:
MV-7012: Functional Mockup Unit (FMU) in MotionView and MotionSolve