RobotStudio event

Problem with External axis

Hi, I've configurated the system in figure

2 External axis, one moves on Y direction the othen on Z direction.
When i try to "Teach Instruction" or a "target" moving along Y direction all works fine.
When i try to "Teach" moving alog Z direction the system return in Z=0 position. Forcing the value from Rapid I've an error of "Joint Out of Range":
50027: Joint Out of Range
Description
Position for Mandrino joint M9DM1 is out of working range.
Actions
Use the joystick to move the joint into its working range.

I don't Understand why! Any suggestions?

Thank's a lot

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