The below MWE, compiled with pdflatex test.tex && biber test && pdflatex test.tex && pdflatex test.tex:
\documentclass{article}
\usepackage[
bibencoding=utf8,
backend=biber,
natbib,
style=ieee,
isbn=true, % should also be for issn?
url=true,
defernumbers=true,
]{biblatex}
\usepackage{filecontents}
\usepackage{hyperref}
% in ieee.bbx, \printfield{issn} done only for @article; standard.bbx also has it for @periodical
\begin{filecontents*}{\jobname.bib}
@article {myinprocs,
author = {Someb Authorb},
title = {{Testing the title of inproceedings}},
pages={123--127},
year={2010},
issn = {2341-2341},
url = {http://example.com/inproc.pdf},
}
@inbook {myinbook,
author = {Some Author},
title = {{Testing the title of inbook}},
url = {http://example.com/inbook.pdf},
publisher={Some Publisher},
pages={123--127},
editor = {Some Editor},
edition = {1},
volume = {2},
series = {My Series},
issn = {1234-1234},
booktitle = {This Booktitle},
address = {Someplace},
year={2008},
month={jun},
}
\end{filecontents*}
\addbibresource{\jobname.bib}
\begin{document}
Testing inbook: \cite{myinbook}, \cite{myinprocs}
\printbibliography[sorting=none]
\end{document}
... output this:

Only the @article type outputs the ISSN field, while it is not output for the @inbook type. I've realized this is because the biblatex style ieee.bbx only does \printfield{issn} for the @article type.
How can I instruct biblatex to print the ISSN field also for the @inbook type - hopefully with the same style it is output in @article (e.g. the word "ISSN" being typeset with small caps)?
inbookcontain a ISSN field? ISBN for the book is ok, but ISSN? – Johannes_B Jun 04 '15 at 21:22inbook(possibly wrongly), now it turns out that book actually has ISSN, so I wanted to include that without changing the downloaded reference too much. Anyways, I managed to solve this using\xpatchbibdriveras in http://tex.stackexchange.com/questions/160152/biblatex-authoryear-ibid-specific-changes-in-bibliography - at a later time, I might post a proper answer (but if someone posts an answer earlier, I'll accept that instead)... Cheers! – sdaau Jun 04 '15 at 21:25@articleand@periodicalare the only types that support aissnfield. – Johannes_B Jun 04 '15 at 21:27biblatex. Due to its verious fields, no machine can parse a bibtex-conform entry to a real usefulbiblatex-conform entry. So adjustments will almost always be needed. – Johannes_B Jun 04 '15 at 21:33