This is the Flexible-Polynomial motion-law.
Its Control-Buttons define its Start-Position and its End-Position. All other motion-values are NOT specified.
It is not defined with a Velocity.
You need to specify the End-Velocity at the end of the Previous-Segment to equal the Start-Velocity of this segment, to avoid a Velocity discontinuity.
Flexible-Polynomial : Two Position | Constant-Velocity
Constant-Velocity: 'Conveyor' Motion-Law