A4003: Found XREF, but no XDEF for label <Label>, ignoring XREF

[WARNING]

The local definition of a label <Label> supersedes a global XREF declaration, if no appropriate XDEF directive is given.

          XREF  main

  

  Code:   SECTION

  

  main:   NOP       ; is local, unless XDEF given

  

          NOP

  

This warning may indicate a forgotten XDEF directive.