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The BaseApp should use the propery AllowInCustomizations for the primary key fields in setup tables.
Furthermore temp fields that are used in SalesHeader / Purchase Header should have this property, too.
STATUS DETAILS
Needs Votes

Business Central Team (administrator)
Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future. Best regards, Business Central Team