I am trying to get the selected values from a multi-select option set and use those values in filtering my subgrid on a form.
I have tried a javascript fetchxml solution which works but only if you have no linked entities in your fetchxml query. But I do.
I have tried writing a plug on the retrievemultiple message which works but I don't see a way to pass in the selected values from the form to my plugin since you can't use a pre or post image.
Anyone have any ideas of how I could make this work? Or tweak what the ideas I have so far to make this work?

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