In both Navision (Dynamics NAV) and Business Central (BC), a field is the fundamental unit of data in a table. Fields define what kind of information is stored, how it is used in business processes, and how other objects—such as pages, reports, and codeunits—interact with it. Each field also has a unique numeric identifier, known as the field number, which plays a critical role in maintaining the stability and consistency of the table schema. Numbering allows fields to be uniquely identified regardless of their names, enables references from other objects without relying on field names, and supports safe data upgrades and migrations.
Nothing speaks louder than code...
and even louder than that is code that actually works :)
Check it on 4coders.own.pl - Evolution of Field Changes in BC
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