biblatex warning

[Wolfgang Engelmann]

What does
Package biblatex Warning: Macro 'note+pages' already defined.
mean?

These are the surrounding messages:

Package biblatex Info: Delimiter 'nametitledelim' in context 'bib' 
already defined, overwriting.
Package biblatex Info: Delimiter 'nametitledelim' in context 'biblist' 
already defined, overwriting.
Package biblatex Info: Delimiter 'finalnamedelim' in context '' already 
defined, overwriting.

Package biblatex Warning: Macro 'note+pages' already defined.
(biblatex)                Using \renewbibmacro.

)
Package biblatex Info: Trying to load citation style 'biblatex-spbasic'...
Package biblatex Info: ... file 'biblatex-spbasic.cbx' found.

Wolfgang