Hi Alex, off the top of my head, I don't think this can be done if you already have values on the field. The single attribute values are stored in a different table than MV attributes, so to do this you might need to do some scripting to convert the older attributes into an MV attribute. If you have a test environment, you could test by adding an attribute as single, adding a value to a few docs, then try to enable the MV flag and see if it allows you to do it and if older values are still present. thanks,
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