Not able to un-merge a dimension in webi report

Hello,

I'm facing an issue in webi reports. That is I'm not able to un-merge a dimension. I'm using BO 4.0 sp 6

I have 6 data providers in my webi report all of those 6 have sales order number in common. The report refreshes fine but a new requirement came in where I had to add another query (data provider) which also has the sales order number.

Now in the report I need to merge the new query's sales order number with the existing merged sales order number. When I un-merge the existing sales order number; webi just does not respond.

Any ideas? thanks in advance.

Regards,

samique