samba - Sep 2005 - Adding static wins entries

I have read, adding static wins entries should work without stopping and
starting nmbd
I?ve tried this and it seems not to work for me.
We have Samba 3.0.14a-21 running on a SuSE SLES9.
If I add entries to the wins.dat when samba is running, nmblookup wont get a
positive answer. After some time the wins.dat gets overwritten with the old
wins.dat without the entries.
 
When I stop nmbd, add the entries and start nmbd nmblookup get a positive answer
and th wins.dat stays there.
 
Is adding entries without restarting samba possible (maybe with a newer
version)?
 
Benny