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I've found a very simple solution (rtfm @myself :twisted:):
\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
shorthand={WA\nopunct},
and the Citation looks like it's ...

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 ...