Add abbreviation TT to Sequential ID

[nazario]

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I need to add the abbreviation "TT" to Sequential IDs, eg: TT123
Also I would like to know how to replace the Track_ID with the Sequential ID in the subject of the mail.

[Klemen]

Unfortunately, this is not something that can be done with the built-in features.

Since sequential IDs are directly from the database (numerical ID starting from 1), you would need to edit all the places it is printed out in the code to achieve what you are looking for.