Where is the right place for Biblatex redefinitions?

[Mathias Girel]

Dear Lyx users,
I need to apply some renewcommands to the standard
ext-biblatex-verbose-trad3 style

% specific settings:
\DeclareFieldFormat{biblabeldate}{#1}
\DeclareDelimFormat[bib]{nameyeardelim}{\addperiod\space}
\DeclareFieldFormat{issuedate}{#1}
\renewcommand*{\volnumdatedelim}{\addcomma\space}
\renewcommand{\newunitpunct}{\addcomma\space}
\renewcommand*{\locpubdelim}{\addcoma\space}

If I put them in the preamble, they seem to be taken into account in the
pdf, but they cause a lot of error warnings (sequences of "undefined" and
"already defined") and I would like to avoid that, since my document is
very long and I might miss other error warnings.
My question is: Is there a better way of inserting these lines? Before the
bibliography in TeX code? Or where?
Thanks for your help!
Best regards
Mathias
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