Hi,
Are you sure these expense like Import Duty not going to booked to any GL nor paid to the Customs Authority or Import Agent, only used for Calculation purposes!
Better use two condition types one for material price, PB00 for Material Price and another (ZZFR)Freight Adjustable (concept in adding Freight amount to inventory account).
For Import duty, just create a condition type ZIMP, as you know formula{(PB00+ZZFR)x6.5/100},just design a routine and assign this routine to ZIMP in your MM pricing procedure.Use this only for information(this value value should not appears in PO layout)
Create a new purchase order, so total price of purchase order is 110 (Material Price = 100 and Freight Adjustable = 10) and DO NOT ENTER tax code in PO.
Create tax code (T1) of 20% tax rate and set default tax code invoice verification for company code as T1 in t.code:OMR2
Do goods receipt for purchase order and during invoice receipt for that purchase order, default tax code T1 appears and 20% tax calculated, enter total value, simulate document and finally post.
Regards,
Biju K