Error in Duty MIRO(Urgent)

Dear Experts,

I have got an issue like this...

User is trying to do Duty MIRO wrto Import PO.It has got 20 line items.

While doing in MIRO,Conditions are displaying two times for only two line items out of 20 line items.

We are using following conditions...Additional Duty,IN Basic Customs,IN CVD,Ecess-Total Customs and Ecess on CVD.

What would be the reason for this?

In POit is showing only once.

Please help me in this issue....

Regards

MK