BibTeX, biblatex and biber ⇒ How to make a style exception for one bib-entry?

[2xJoe]

Hi,

I've got a problem with one of my cited works. I use biblatex with bibstyle=authortitle and citestyle=authortitle-ibid.
This especial work consist of multiple volumes, but in the bibliography at the end, only the work as a whole should be cited (as it is right now).
So I've got the simple entry in my .bib-file:

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@book{WA,
	author={Martin Luther},
	title={Werke},
	shorthand={WA},
	subtitle={Kritische Gesamtausgabe},
	location={Weimar},
	year={1883--2009},
	keywords={quelle},
	pagination={none},
}

and a working example .tex-file would be

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\documentclass{scrreprt}
\usepackage[bibstyle=authortitle, citestyle=authortitle-ibid, citetracker=constrict, ibidtracker=constrict, opcittracker=constrict, loccittracker=constrict, dashed=false]{biblatex}
\bibliography{minbib}

\begin{document}


Ubir das, ßo sein wir yhe alle priester, (\ldots) alle einen glauben, ein Evangely, einerley sacrament haben, wie solten wir den nit auch haben macht,
zuschmecken und urteylen, was do recht odder unrecht ym glaubenn were? wo bleybt das wort Pauli i. Corint. ij. 'Ein geistlicher  mensch richtet alle ding, unnd wirt von niemants gerichtet', und 'wir haben alle eynen geyst des glaubens'? wie solten wir denn nit fulen ßo  wol als ein ungleubiger bapst, was dem glauben eben odder uneben ist? Auß dießem allenn und vielen andern spruchen sollen wir mutig und frey werden, unnd den geyst der freyheit (wie yhn Paulus nennet) nit lassen mit ertichten wortten der Bepst abschrecken, sondern frisch hyndurch allis, was sie thun odder lassen, nach unserm gleubigen vorstand der schrift richten, und sie zwingen zufolgen dem bessern unnd nit yhrem eygen vorstand. \footcite[6; 412,20--31]{WA}

The citation should look like in this\footnote{WA 6; 412,20--31} footnote instead.

\printbibliography

\end{document}

The convention for referencing this Work at my university is "WA Volume#; Page#,Line#–Line#.", for example "WA 6; 123,4–9."
Because the work is only referenced to as "WA" and the volume belongs to the Page-and-Line-Reference, I cite by:

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\footcite[6; 123,4-9]{WA}

The output is okay, apart from the "," after the shorthand: Bibtex writes (consistently) "WA, 6; 123,4-9."

So I want to change the citestyle, but only for this entry. Is there anyway?
Or do I have to create a new entry Type "@book_mv" e.g., clone the style for @book and edit it (remove the comma)?

Any help appreciated, google and forum searches didn't help me yet.

Regards, Johannes

[2xJoe]

I've found a very simple solution (rtfm @myself ):

\nopunct Adds an internal marker which will cause the next punctuation command to print
nothing.

(biblatex manual p. 146)

I only had to add \nopunct in the line of my .bib-file

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shorthand={WA\nopunct},

and the Citation looks like it's supposed to be in this special case:
"WA 7; 21,1–4."

I ♥ Bibtex