Update hiredate to backdated date of a employee using hdl(HCM Data loader)

Summary

Error while updating hiredate of any employee with old date(back dated) using hdl

Content

Hello Every body , 

 

I have a requirement as below , 

1) for existing employee need to update hiredate with back dated. Ex:- Current Date - 01/01/2015           New Start Date: 25/09/1978

2) After updating hire date or along with hiredate need to update person number. 

3) After updating hire date , person number or along with person number , hiredate need to update assignments based on new start date. 

I need to achive above 3 points using hdl data loader and if any body having idea or experienced earlier please suggest me with some of the sample scripts.