emp vendor line item wise posting

Hi Experts,

Client requirement is to do personnel vendor account posting for employees whose loan is running instead of expense accounts.

I have configured the steps to meet the requirement in CDV for testing: working on SAP ECC 6.0

1. Define Symbolic account  (V_T52EK): set Acc asign type ="K "

2. Define Posting Characteristics of Wage Types

3. Assign Vendor Accounts

     9052  *0002 *0002

Payroll is run for the employee whose vendor account is created, then posted to FI. However, when an employee has 2 or 3 loans then system is posting cumulative amount in employee vendor account.

For example : Employee id :10100001

Loan 1 deduction: 10000

Loan 2 deduction:   5000

Loan 3 deduction:   2000

Vendor account posting is  10100001 : 17000

how can i fix  to post line item wise employee's loan deductions.

waiting for reply.