Microsoft has updated the guidelines for AL development of extension V2. Caused on conflicts between multiple apps which have been installed on the same database it is required to use a Prefix (or Suffix) in all Object Names and Field Names.
That means for all who plan to provide their existing solution at the App Source they have to rename everything, at least after transforming into AL code. Most important thing before doing that is that you should register your Prefix/Suffix.
At the end of this article you can find the address where you can register your Prefix/Suffix: “Contact us at email@example.com to reserve the prefix/suffix of your choosing”