if Syn-NAVApp allow link we json file to map table ID and Name or only base on ID, that will help to migrate data from CAL to AL, especially those old add-ons. We have some add-ons in NAV for years, and we also publish those add-ons as Apps for Business Central. We do our best to keep table ID and fields ID same, but for tables and fields name, we need add mandatory prefix, that end with name will be different and cannot upgrade automatically. And also some table and field name, we need change a little bit since with prefix, it over 30 chars.

Thanks
Tom