Can't modify array of position!

Hello,
i create a program with an array of position

arrayPosition : ARRAY[10] OF POSITION

My problem is that i can't modify these position by the "mod" key in the teach pendant
Does anyone know why or how i can solve it?

Thank you so much!!

Sorry for late reply..
No, i've solved in another way (Simple position, no array)
Next days i'll have a Comau to move and I'll try with this login!
Thank you