Issue changing element of an array

Can you share more of your code performing the save?  Is this within a button?  

Otherwise the a!save() expression you note above should not have any issues when used within a user interaction.

a!localVariables(
  local!array: {false,false},
  {
    a!richTextDisplayField(
      value: a!forEach(
        items: local!array,
        expression: {
          tostring(fv!item),
          char(13)
        }
      )
    ),
    a!buttonArrayLayout(
      align: "START",
      buttons: {
        a!buttonWidget(
          label: "Save",
          saveInto: a!save(local!array[1],true)
        )
      }
    )
  }
)

yes, but my local!array is defined like this (as the number of elements is vary, the array size will be same as the size of another arrary: somereferarray ):

local!array : a!forEach(
  items: somereferarray,
  expression: false
),

then it does not work

yes, but my local!array is defined like this (as the number of elements is vary, the array size will be same as the size of another arrary: somereferarray ):

local!array : a!forEach(
  items: somereferarray,
  expression: false
),

then it does not work