[O] temporary org-capture-templates

[Uwe Brauer]

Hi

I would like to one entry for the org-capture-templates
which will prompt for the file I want to save the capture.

So I tried 

(setq org-capture-templates
'(
("G" "Generic" table-line (file+headline (read-string "Name of file: " 
"Generic")
"|%f| %U|%A|" :prepend t))))

But it does not work.

Any suggestions?

Thanks

Uwe Brauer