account det error

hi,

while billing i am getting this error.

How to proceed

Document Date Qty/value UoM/Cur Overall proc. status Materia

.. Standard Order 8175 / 10 11.07.07 10.000 EA Completed

. Delivery 80011326 / 10 11.07.07 10.000 EA Completed

Invoice 90033115 / 10 11.07.07 10.000 EA Acct determin error

thanks in advance

Regards

Hema