For various reasons, sometimes fields need to be cleaned up/hidden within Marketo. This requires removing field references first, which ensures the field is not in use prior to hiding from the Maketo UI.
However, when a field is in use in the Smart List of an Email program AND that Email program has been sent, there appears to be no way to remove the field from the Smart List.
Of course, one can obviously delete the email program altogether, but this results in loss of any metrics, the email asset itself, etc.
I have engaged with Support, but meanwhile, I'm curious if anyone else ever dealt with this before.
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