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var objSublist = objRecord.getSublist({
sublistId: 'item'
});

var objField = objSublist.getField({
fieldId: 'item'
}).;
objField.isDisabled = true;

field.updateDisplayType({
    displayType: serverWidget.FieldDisplayType.DISABLED
});
should work too I believe.

:disappointed: both solutions did not work. Thanks thou

maybe share your code? BTW you actually running the code for each column concerned right?

Untitled

Here's a snippet of an inlineeditor sublist with a column set to disabled, that works for me.

Excellent. It's working. It was my fault. Sorry