SAP Successfactor LAST_MODIFIED_ON

Hi Experts,

I am new to SuccessFactors and I am asked to review standard kronos package "Packaged Integration - SF EC to Kronos" which does query compound employee

While reviewing the iflow I could not understand the use of below header and external parameters

1) KR_LAST_MODIFIED_ON

2) ECKR_LAST_MODIFIED_ON

3) person_id_external

4) hourlyPicklistCode

Please help understand the need and usage of these parameters in iflow

Points will be awarded

sfsf-kronos.png

Thanks