TagNum fields are similar to ints, but with the additional semantics that they reference a particular FIX tag. They are most often used in error workflows, when required tags have been omitted or when fields contain invalid values.
A TagNum is a positive integer. It is encoded identically to an int field, except it may not contain leading zeroes.
| Example | Valid | Notes |
|---|---|---|
| 23 | ||
| 00023 | May not contain leading zeroes | |
| 0 | Must be positive |