Modifying Paybles SLA rule for T&E invoices inported from Expense could

Summary:

We are implementing a new SLA rule in oracle ERP Fusion for 'Payment request'(T&E invoices Expense template:PCARD) invoice types imported from Expense Cloud to automatically replace the deparment(which is second segment in our COA) code from '4XXX6' with the employee's default epsense deparment code for miscellaneous lines.
During SLA rule configuration, we are not able to get any source that there is available in SLA setup to provides the employees's default expense account for miscellaneous invoice line assoiated with employee who incurred the expense
Requirement:
Currently, the miscellaneous line in T&E invoice or PCARD transaction is generated using default clearing account, where the department code is 4XXX6- this is same for all such transactions. we need to an SLA rule that dynamically replaces this dept code with employee's default expense account department segment which is also the department segment in the item line in our case.