Dimensional model design for multiple relations btween a fact and dimension

Hi,
I'm new here, sorry if I ask dummy questions.
I need to develop a dimensional datamodel to create some reports. The initial model has a transaction table. A transaction can be related to one or more customers, because of that the there is a customer_id column, but it can contains more id's, separated by commas. The customer table is standard : id/ name/etc.
I need to create a report (I'm using OBI 10g if this is relevant) to show all the transactions related to a customer (prompt) and the report must contain the some transaction details, the id's of all customers related to that transaction and their names.
For example, if I have a transaction with tranz_name = 'transaction_name' and customer_id = '1,2,3' and I need to select all the transactions related to customer 1, I need to show in the report :
'transaction_name' , '1,2,3' , 'Customer_1, Customer2, Customer_3'.
How can I design the dimensional datamodel to have support for this report? I was thinking to create an additional "cust_id" column in the fact table and for the above transaction to load 3 records in the fact table, by filling the cust_id with only one id (the PK of the fact table will be transaction_id + cust_id). But I have 2 problems :
a) How can I create the "CustomerNames" column in the report?
b) How can I select unique transactions if "all customers" is selected in the prompt?
Thanks in advance for your help

Are you using the OLAP Option in the database to define your report? If so, which version of the database do you have? If not, you may get a better response from an OBI specific forum such as "Business Intelligence Suite Enterprise Edition"
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