UK Payroll Payslip - Display Assignment Number Against Earnings and Deductions Using UK Payslip XML

We have a requirement in UK Payroll whereby an employee may hold multiple assignments under the same Payroll Relationship and receive a single consolidated payslip. To provide greater clarity, the Assignment Number should be displayed against each earning and deduction entry, enabling employees to easily identify the assignment associated with each earning and deduction component.
Oracle Support has advised that customization of the delivered payslip template may be possible if the required Assignment Number information is available in the delivered payslip XML at earnings/deduction line level. However, it is unclear whether assignment attribution is available for each archived earnings or deduction result.