Account determination for entry TCOA WRX not possible

Dear Experts,

I am facing a problem.. service entry sheet can not be accepted (ML81N).. but GR (MIGO) is ok.

When i going to accept SE system throws an error message as follows:

Account determination for entry TCOA WRX not possible

i checked obyc for WRX my service master VL is link with a GL there, i did not find any clue for this error yet.

Please help me.

Regards,

Zusen