CVD and Modvat clearing account

Here i run the import cycle

PO - MIRO (CUSTOM) - MIGO (Part1) - Part 2 (J1IEX)

But when i post the Excise Part2 there is an accounting document showing credit of all duties goes into Modvat clearing account instead of CVD clearing account.But when i m changing the company code setting for CVD G/L ,then it appears correctly.But it is customising setting no one is allowed to change it.Then how that modvat receivable G/L appears ? Pl suggest.

Regards,

Harshad