Ah no, this is a different thing. The Custom entry types dialog has no effect on the order in which the fields are written per entry. It only has an effect on the entry editor.
---
title: BibTeX file changes over time
id: bibtex-file-changes-over-time
author: "[Oliver Kopp](https://github.com/koppor/)"
---
JabRef changed the writing of a BibTeX file over time.
This blog article aims presenting the different BibTeX contents for different JabRef versions.
The semantics of the content was never changed, but the "layout" in the file.
That lead to huge complaints over the time.
Especially, when a group used different JabRef versions.
The JabRef team decided in 2015 that this side effect is not acceptable and that only the parts of the bibliopgraphy touch by JabRef should be rewritten.
This was implemented in JabRef 3.1, released on 2015-12-24.
The discussions on a "useful" serialization of BibTeX entries continues.
This blog post lists the evolution of JabRef's chosen serialzation over time.
The aim is to i) make the changes over time transparent and ii) to support discussions on a "useful" serialization format.
The example used can be found in [bibtex-file-changes-over-time-demo.bib](../bib/bibtex-file-changes-over-time-demo.bib).
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See also How to specify the order of fields of each entry when saving?