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Correct answer by
Level 2

Ok I've found an answear if anyone wants to know.

Put this Formcalc inside layout:ready event for the subform these checkboxes are in. So no code is neccesarry inside the checkboxes.

Heres the code for the layout:ready part

if (Sum(subform.checkbox2, subform.checkbox3) ge 2) then

    checkbox1.access = "readOnly"

else

  checkbox1.access = "open"

endif

if (Sum(subform.checkbox1, subform.checkbox3) ge 2) then

    checkbox2.access = "readOnly"

else

  checkbox2.access = "open"

endif

if (Sum(subform.checkbox1, subform.checkbox2) ge 2) then

    checkbox3.access = "readOnly"

else

  checkbox3.access = "open"

endif

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