Querying on aggregates created on Virtual Cube

Hello,
I have implemented a virtual InfoProvider with Services.When I create queries directly on the Virtual Infoprovider the query runs fine and I see the report.
As per my requirement I create an aggregate on the Virtual Infoprovider .Then I define a query on the aggregate .But when I execute this query I get the following errors :
Error reading the data of InfoProvider AG4
An exception with the type CX_SY_REF_IS_INITIAL occurred, but was neither handled locally, nor declared in a RAISING clause
Dereferencing of the NULL reference.
Would appreciate any assistance on this topic.
Thanks
Priyadarshi

Yes it is possible to create aggregates on Virtual cubes.
I will be grateful if hope anybody who is aware of the method of aggreagate creation and who has faced similar issues comes forward and throws some light on what could be the error.
Thanks

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null

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Hi,
VirtualProviders
InfoProvider with transaction data that is not stored in the object itself, but which is read directly for analysis and reporting purposes. The relevant data can be from the BI system or from other SAP or non-SAP systems.
VirtualProviders only allow read access to data.
Various VirtualProviders are available. You use these in different scenarios.
For more information, see:
●      VirtualProvider Based on the Data Transfer Process
http://help.sap.com/saphelp_nw04s/helpdata/en/da/5909392a430303e10000000a114084/content.htm
●      VirtualProvider with BAPI
http://help.sap.com/saphelp_nw04s/helpdata/en/26/39dc37bff7a66de10000009b38f889/content.htm
●      VirtualProvider with Function Modules
http://help.sap.com/saphelp_nw04s/helpdata/en/62/d2e26b696b11d5b2f50050da4c74dc/content.htm
●      Using InfoObjects as VirtualProviderss
http://help.sap.com/saphelp_nw04s/helpdata/en/45/13baccabbe5d78e10000000a11466f/content.htm
Note that the system does not run existing exits or customer and application extensions (customer exit, BTE, BAdI) for direct access to the source system.
http://help.sap.com/saphelp_nw04s/helpdata/en/23/c0234239f75733e10000000a155106/frameset.htm
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Querying on aggregates created on Virtual Cube

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