Exchange rate in MIGO

Dear All

I am facing a problem in Exchange rate. I have created one po with currency HKD and exchange rate in 5.85. After that I have done custom MIRO in INR and then received the material through MIGO. Now I in accounting entries of MIGO. now you can see the entries of MIGO.

RM (Imp) 2,042.56 HKD 12,148.98

GR/IR Clg a/c 2,000.00- HKD 11,900.00-

Customs Clr. A/c 40.00- HKD 234.00-

Customs Clr. A/c 1.71- HKD 9.98-

Customs Clr. A/c 0.85- HKD 5.00-

This is taking two exchange rates 5.95 and 5.85 , while in my table and in PO, echange rate is 5.85.

Please guide.

Regards