In my instance, we've added a number of Typeahead fields over the years that we've come to regret, mainly because they appear as top-level objects in Reporting tools and confuse everyone trying to build reporting. I can only explain why Project reports show two Portfolio and Program options with completely different options under them so many times. (Yes, I could re-name the fields but I wanted a better solution.)
Finally I decided to experiment with replacing the Typeaheads with External Reference fields that looked the information up from Workfront's API instead. I've included a set of examples below for the objects I replaced, along with some gotchas I found along the way.
Notes.
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our only gotchas that are not on your list is that external lookup fields are not working (do not display or are not functional) on dashboards and in the new Home Workspace.
Ahh, good add! For Dashboards, I've had luck with creating a text-mode column that references the field with "valueexpression=" syntax to at least make it visible but still not able to be interacted with. I haven't experimented to see if that would make it visible in the new workspace too.
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we've discussed doing similar, but it did spur a conversation about users who like to create their own reports, and does underline that some of our dropdown fields are high maintenance (always getting inline edited). We're continuing to pursue enhancement requests that bring functional parity, but appreciate that textmode continues to be a workaround in many cases.
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Adding to the list of gotchas: the external lookup field on a request custom form will not display in the Outlook plugin (e.g. if you want to convert an email to a request via queue), and in the Teams app (e.g. if you want to submit a request from there).
It does display in the mobile app, but I cannot toggle it (so it's non functional).
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