flex - Cannot assign to a non-reference value -

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I have a strange problem, I have an XMLList with elements that have attribute status of 0 to 0 . When I want to add text to the element of that XMLList by following statement, I get an error message: 

  textElements (@ Position == columnIndex) = "anyString";

1050: A non-reference value can not be assigned.

What's wrong with this?

Thank you Marcus while working with XMLLists

You should be a bit more specific . You have to really tell that the list you want to change is also in the list, when you filter it below 1. This should do this for you: 

  textElements. (@ Position = = column index) [0] = "any string";

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