Andy That is just what I was looking for and worked for me at test system for Merge replication.

But there is just 1 thing that I can not set it back.

I am trying to disable to updating system tables :

exec sp_configure 'allow updates',0

go

reconfigure

GO

It seems updated but then i try to rerun the code update sysdatabases set category=0 and it works again.

so seems like once you set enable updating there is no turning back?

what may I do to disable it back.

isn't it a bit risky?