In the bibliography of an article I have to suppress the "series" field, and I use \AtEveryBibitem{\clearfield{series}}. It works as expected. However, in the related entries the series is printed anyway. What I am missing? This is a MWE:
\documentclass[a4paper]{article}
\begin{filecontents}{\jobname.bib}
@BOOK{Norberg:Introduction-fr,
address = {Stockholm},
author = {Norberg, Dag},
publisher = {Almqvist \& Wiksell},
title = {{I}ntroduction a l'étude de la versification latine médiévale},
year = {1958},
series = {Acta Universitatis Stockolmiensis. Studia Latina Stockholmiensia
5},
langid = {french},
}
@BOOK{Norberg:Introduction-en,
address = {Washington, D.C.},
author = {Norberg, Dag},
editor = {Ziolkowski, Jan M.},
publisher = {Catholic University of America Press},
title = {{A}n introduction to the study of {M}edieval {L}atin versification},
year = {2004},
related = {Norberg:Introduction-fr},
relatedtype = {translationof},
series = {Medieval Culture},
langid = {american},
translator = {Roti, Grant C. and de La Chapelle Skubly, Jacqueline}
}
\end{filecontents}
\usepackage{csquotes}
\usepackage[style=authortitle,backend=biber,autocite=plain]{biblatex}
\AtEveryBibitem{\clearfield{series}}
\addbibresource{\jobname.bib}
\begin{document}
See \autocite[44]{Norberg:Introduction-en}.
\printbibliography
\end{document}
If I cite the original text, not the translation, the series field is not printed.

Thanks you for your kind attention. guido, Italy
\clearfieldoften works well enough, but there are edge cases like this one that pop up from time to time and that are tricky to get right, so that's why I always recommend a sourcemap to get rid of a field. – moewe Sep 17 '23 at 16:19\DeclareSourcemapbefore, but if I understand correctly this command works at a deeper level in comparison with\clearfield. It is interesting that e.g. a similar command withtranslator(\clearname) works also with related entries. Perhaps a clarification in the biblatex manual might be useful. Thanks a lot, my publisher will be grateful too... – user41386 Sep 17 '23 at 17:12