This AdSpec is sold in US Dollar and Euro on two different price list: Special and Standardlists. But once sold it can't be sold at another price. Therefore it also has a self-blocking record.
If I sell it now to one customer for a specific day the booking calendar will show it as blocked so that I can't double book.
Here is what the booking calendar for that item will look like.
Please make sure to include the column AdSpec Name into the layout otherwise the second line would not show in red!