Valid Occurrence Number Formats

All occurrences have a similar format. A then two numbers, then a letter, and then four numbers. See below for what letters are viable for the fourth character slot.

Domestic Occurrences:

A, C, H, O, P, Q, W

Example occurrences: A11Q8593, A53A0053, A25C0001

Foreign Occurrences:

F

Example occurrences: A01F0043, A44F0063

If you for whatever reason need to adjust or find where this is defined, search the NORMS code for:

[A]\\d{2}[HFPAOQCW]{1}\\d{4}