SD-Accounting Determination Issue

Dear Gurus,

I did the account determination in VKOA with proper settings.

After creating the invoice the account determination is happening but the accounts are posting in reverse direction.

I have maintained expense GLs in GL account column and Provision accounts in Provision accounts column in VKOA.

But in the invoice (accounting document) the expense GLs are posting at credit side and provision GLs are posting at debit side.

So I have swapped the GLs in VKOA, then the postings are happening correctly.  Please let me know what could be the problem.

Is there any problem in GL accounts or VKOA ???

Thanks,

Sreehari