Add a field to LedgerTransStatement Report

I am quite new to DAX 2009. I am asked to add a field PaymReference to LedgerTransStatement report. The report is based on a temporary table tmpDimTransExtract. I have been looking into the FETCH method to find out the query which picks the transactions and put in the temporary table so that I can modify the query but I am unable to find out the query or maybe I do not know how the query is getting executed. The execution path for this report is Ledger/Chart of Account Details/Account Statement/Select/Ledger Account

If anybody can guide me a bit, I will appreciate.

Thanks.

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