wrong A/C getting debited in Invoice distribution

[pradip_m]

dear Members
I need a solution for the below mentioned problem
I have been using Oracle 11i India Localisation .
The problem i am facing is that after matching with the PO( 4 way matching) in the payables Invoice workbench,the default accounts which are getting debited is Inventory A/P accrual
account for all the line,
ideally it should be the respective account which are defaulted from the Purchase Order (In the Purchase order
for each Line we attach tax with multiple line like BED, Higher cess on BED, VAT/CST etc etc).
Now when the distribution takes place in the invoice workbench after create accounting, ideally it should be the distribution
comprising those account that are defined in the PO line
can anybody suggest where is the problem in the setup
In the Purchasing option i have used acccrue expense items "AT Receipt"initially
I tried and changed it to period end in my test instance to check if it gives the desired result, but it did not

waiting for your invaluable feedback

regards
Pradip
[:)]