Using PUT for iMIS Desktop User Defined Tables

When attempting to update some data in a user defined table that was created through the iMIS desktop application, I received the following error message:

{"$type":"System.Web.Http.HttpError, System.Web.Http","Message":"The requested resource does not support http method 'PUT'."}

Is it true that these tables do not support PUT? Also, as we are working on our move to the iMIS cloud, how are these tables converted during the upgrade process? Should we create panel sources to replace these desktop user defined tables?

Thanks,
Korey