Immutable field / association

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Hey ! Another stupid question : how can I make a field / association immutable ? Which means : possible to set a value in the frontend, but as soon as the object is commited in db, impossible to change the value …. I tried conditional editability based on createdDate / changedDate, but the field is locked even in creation  .. Any suggestion ?
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1 answers
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Okay, I found it : editability has to be defined on “conditionally”, and expression is “isNew($currentObject)”

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