Self-trading prevention: 

The Self Trade Prevention functionality does not apply for Xbid products, but still on Nord Pool (Local) Products.

If a member wish to prevent trading between two or more portfolios within the same company, they can apply this restriction by sending an email to and provide a list of portfolios that should not cross match. Example:

PortfolioPrevent from matching with portfolio: 
example_portfolio1            example_portfolio2, example_portfolio3

Once restrictions are added by our support, you need to re-login to apply the changes. If you are about to trade between two portfolios where you applied self-trading restriction you will get the below warning:

The self trade notification only applies when both orders were placed on the same NEMO platform: Nord Pool.

In cases where you or another market participants perform a self trade, the trade price will be flagged with a star "*" in the ticker.. 

This is further explained here: