2 of 2 people found this helpful
here you have an interesting article about Data Blending:
Basically, when you relate secondary data you have to make sure that there is only one matching member in the secondary dimension for each mark. If there are multiple matching members you will see an asterisk in the view. All secondary fields are aggregated. Dimensions are aggregated as Attributes (ATTR), which means that if there’s only one member it will show the member value but if there are multiple members it will show an asterisk.