Error in cancellation of Invoice.

Hi!!! Guys,

I have created invoice (VF01) with reference to delivery number and i have release to accounting.

*My problem is when i am trying to cancel Invoice(VF11) it is giving me a error. "Entries are missing in table TPAER for partner group."

Please help me in sloving this issue.

Points will be rewarded.

-Regards

AKASH