I have made a simple linkage mechanism. I have uploaded the assembly file. The simulation result should come the same as using the manipulation parameter with respect to constraints and using drag along XZ plane. You can try that in assembly. But in DMU kinematics, after conversion of constraints into joints, fixing the part, adding commands, I am not able to simulate it at all. There is something wrong while placing the commands. Please someone work on it and simulate it asap!!!!