NEST error message:
IFC01916 - You must provide a valid header or trailer record. Please ensure the payment source and frequency are correct and that the payment due date is in the correct format - it should match an existing contribution schedule on the system. Please check your data and try again.
The issue is typically caused by a mismatch of Group or subGroup between the NEST records and the payroll data.
Alternatively, the error could be caused by there being no active members in the scheme in this period, so NEST has no expectation of data for the period being submitted