Sorin,

<< On my case the column that link to the master table and an other column from the detail table are the primary key.  When I post a cached table with a duplicate primary key values it's raise an error. >>

You can trap this with an OnPostError event handler on your table/query/script/storedproc component.

<< And I want to raise an error before the user try to commit the cached data. >>

Okay, I think I may be finally getting it.  Are you trying to verify whether the cached rows are going to create primary key errors during the ApplyCachedUpdates call, as opposed to during a Post operation on the cached table ?

Tim Young
Elevate Software
www.elevatesoft.com