External Lookup fields with HTTP Put or Post methods

@vynetary just checking in! Were you able to get this resolved? If one of the replies above helped—whether it completely solved the issue or simply pointed you in the right direction—marking it as accepted can make it much easier for others with the same question to find a solution. And if you found a different way to fix it, sharing your approach would be a great contribution to the community. Your follow-up not only helps close the loop but also ensures others benefit from your experience. Thanks so much for being part of the conversation!

Vyneta, I've not used the PUT or POST functionality either for the same reason, haven't had a usecase that would make sense.  I do use them with GET a fair amount, as example since the Issues object isn't part of typeahead field I've used external lookup to allow users to see existing issues that might tie into a new request they are creating to help tie into reporting.