Hi,
Infotype 0003 is generally edited by the system only and is automatically created when an employee is hired. The system automatically updates infotype 0003 Payroll Status when the payroll is run, time is evaluated, changes are made to the payroll past for the employee or changes to infotypes which will have an impact in payroll & time evaluations like IT8, 14 , 15 ,2001, 2013.
Since in your case, employees are not hired directly in SAP rather sent via IDOC to SAP, IT003 will not be automatically created. You can program it to be updated via code whenever inbound IDOC hitting the SAP system, otherwise, it will be only updated in the above mentioned cases.
You can create manually via PU03 or report RPUTRBK0.
br
Susmita