NWBC Error at Freight Unit

Dear TM Experts,

We are not able to open certain freight units from NWBC. Tried with both OBTR-> Document flow navigation option and also from Freight Unit Display option in NWBC. We are getting Error as below, also we get a dump with details as ASSERTION_FAILED (The ASSERT condition was violated.)

500 SAP Internal Server Error

ERROR: The ASSERT condition was violated. (termination: RABAX_STATE)

Please help me with this issue, I think their is some issue at FUBR level but how to find out what exactly is the issue as we cannot stop a BREAK-POINT at NWBC.

Thanks in advance.

Regards,

Md.Rafi