Navigational Attribute error in Bex query

Dear Experts,

I have virtual provider and in which I have Dimlist (property of account dimension) as Navigational Attribute. I have added same in my composite provider and aggregation level, when I create BEx query using this navigational attribute I am getting the following error,

"[64fb-2399-1c] Nested exception. See inner exception below for more details:
Termination message sent ABEND RS_EXCEPTION (000): Dereferencing of the NULL reference MSGV1: Dereferencing of the NULL reference"

And it is working fine when I use GL account dimension in Query, also master data is maintained properly.

Let me know if I am doing something wrong.

Thank you.