Field and Variable naming
In general, the rules for naming fields (data elements in a table) and variables (data elements within the working storage of an object) are the same, and we will discuss them on that basis. The Developer and IT Pro Help section's Naming Conventions describes many recommended best practices for naming within NAV. A lot of additional information can also be found in the recently released C/AL Coding Guidelines at https://community.dynamics.com/nav/w/designpatterns/156.cal-coding-guidelines, which includes a How do I video.
Variables in NAV can either be global (with a scope across the breadth of an object) or local (with a scope only within a single function). Variable names should be unique within the sphere of their scope. There must not be any duplication between global and local names. Even though the same local name can be used in more than one function within the same object, doing so is not a good idea and will almost certainly confuse the next...
