Document flow status problem.

Hi experts i am facing problem in document flow,i need ur inputs to solve the problem.

I have created one billing doc and accounting document is generated after this i have cancelld this billing document so the accounting document is cancelled upto this everything is fine.But the roblem is in document flow status for all these 4 douments its showing STATUS as

For Billing >>>> status its showing Completed

Accounting >>>>status its showing Cleared

where it should show for cancelled invoice and accounting document status as canlled.

so could anyone help me out where i am going wrong.

Thanks a alot to everyone.