Don't worry, I just remembered I had answered that one before.

You're welcome, Fabian.

I thinked about creating a custom public property like the help says, but I missed to create the underliyng dataRow on datatable. I searched the forum but seems that not used the correct words that guide me to the post that you mention with the exactly solution that I need

Hi Fabian.

Have a look at this post:

http://forum.strataframe.net/FindPost17401.aspx

I like that my BO have additionally to the mapped sql fields a dummy "field" to put temporal data (not like/need to save this, but need to maintain in memory this data at start of my application)