How to default Output tax account for self assessed taxes in Accounts Payable

HI,

My tax setup is as follows

Taxes                                1

Tax Status                     3 (Standard, Exempt, Zero)

Tax Rate                        3 (One tax rate for each tax status)

For Input Taxes, GL Tax accounts are assigned at Tax Rates

For Output Taxes, GL Tax Accounts are assigned at Auto Accounting

Have seperate GL Accounts for Input Taxes and Output Taxes.

At present for Self Assessed Taxes in Oracle Payables, the Input Tax Account is getting defaulted for both  Receivable and Liability

How can I default my Output tax GL account to default for Liability class