Why do we need two tables before OBIEE answer will work ?

I just imported a physiical table and dragged it to BMM layer and to presentation layer. I am getting these error messages after I save
" nQsError 15001 could not load navigation space for subject area xxxx '
15013 Logical table xxxx does not join to any other logical table
Wondering why we need a join if there are no other tables
thanks

It's a conception of BI Tool. It will be at least one dimension and one fact with link between.

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