> 
> Every now and then (around once a week) one (any of them)
> of the  
> subscribers fails to replicate the origin's data with
> the following  
> message in the log:
> ERROR:  duplicate key value violates unique constraint
> "xyz"
> 
> There is no further indication in the logs what could have
> been the  
> cause for this problem.
> 

Can you post the table definition?  Do you have any sequences on the table? And if so are they replicated?

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