NetSuite is set up with a default payable account that will be credited each time reimbursable expenses are exported as Expense Reports to NetSuite (as supervisor and accounting approved). In some cases you may want to change this to credit a different account.
To do this:
Navigate to Setup > Accounting > Accounting Preferences in NetSuite
Click Time & Expenses tab
Under Expenses section, there is a field for Default Payable Account for Expense Reports, choose the preferred account.