Same dimension in two different fact tables

Hi,
I have one same dimension in two different fact tables. I would like to know how BI server choose the fact table when I do a request in this dimension.
I know that is always using the same fact table, but I would like to know why choose this table and not the other.
Thanks

Sorry,
But it doesn't seem to me.
I reorded the tables in the BMM layer and it continues to use the same table, regardless this table is in last.
After, I droped that table in the BMM layer and it continued to use the same.
Thanks for your reply

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