Inquiry about data table when creating a series

I would like to create a drop down series to show claim status with the value of Valid and Invalid. In data table field, there are two choices. One is <data>claim and the other is <level>claim. May I know what the difference is between these two? The creation of this series actually added one column in settlement table but settlement table is not showing in Data Table drop down list. How do I know when I choose claim in Data table, it actually means settlement table? Please find details in the attachment.