About Incompatible Initial Conditions
When you click OK in the Initial Condition Definition dialog box, a validation check is performed. The system searches for such things as duplicate names, the last selected velocity constraint, correct direction, vector location, and velocity constraints both individually and as a group.
If the initial conditions are incompatible, an error message indicates that the velocity constraints could not be satisfied and the initial conditions are invalid.
Incompatible initial conditions can occur when initial conditions:
• Violate connection constraints.
• Conflict with other initial conditions.
Troubleshooting techniques include:
• Putting the initial condition on the motion axis rather than on the rigid body (for nonpackaged components).
• After selecting a snapshot for the initial configuration, applying velocity initial conditions one at a time and clicking 
to check for conflicts.
to check for conflicts.