Converting MDX *MEMBERSET(%ACCLIST%) statement to SQL

Hi Experts

In our ACCOUNT dimension we have multiple hierarchies and frequently use the following selection in logic scripts to select all members who have account A100 as ultimate parent.

*MEMBERSET(%ACCLIST%, "Descendants(ACCOUNT.A100,999,leaves)" 

I would like to convert this logic into a SQL select statement for use outside BPC to return the same data set.

In the underlying database the table dbo.dimAccount appears to hold the information needed to identify the members relationship to the ultimate parent but its not clear how this table is structured or used to store these relationships. In our case there are 14 column IDs but no explanation of how they relate to the hierarchies we have defined.

Can anyone offer any advise or point to some relevant documentation on how this dim table is structured?

Thanks in advance

Alan

BPC 10 Microsoft Platform