MR11 : wrong account determination

Dear.

For a stock transport purchase order position I manage a specific freight condition type with account key and accruals ZN2.

After goods issue for the po the system create an accounting document involving the account of transaction ZN2.

If I try to run MR11 in order to cancel the clearing account for this purchase order the system donu2019t update the account of transaction ZN2 instead try to update the account of transaction PRD and EKG.

I donu2019t understand this behavior.

Do you help me ?

Thanks.