ABAP HR - How to insert payroll results using fm PYXX_WRITE_PAYROLL_RESULT

Hi,

I have a scenario where I want to read cluster information (PCL2 RX) from system A and insert it into system B. Both systems are SAP ECC 6.0. Employee master data already exists on target system, but no payroll results yet, so this is an insert and not an update.

I am using fm PYXX_READ_PAYROLL_RESULT (I also tried with HRCM_PAYROLL_RESULTS_GET) to read the data and then calling a RFC on system B where I use fm PYXX_WRITE_PAYROLL_RESULT to write the payroll results into database. Is this fm only to use in case of update, or it should also work when inserting new lines on the cluster? Because I always get a sy-subrc=0 but nothing is created on the db. Is there any other way to this? Do you have any code samples?

Many thanks,

Miguel