workflow issue in HCM Process and Forms

Hi,

I have created one  workflow for HCM Process and form ( Termination) . In that workflow, there are Two levels. First and second level is approved by the respective managers. I am using the Standard TASK TS17900100  both levels having the  Send,  "BACK TO AUTHOR" option.

When I initiate the form it has generated the process reference number, it went to first level approval  and the respective manger receivedwork item in his UWL inbox  in this stage I have checked in backend (PA20)  infotypes( 0 & 1) are updating automatically and employee has been terminated without approval of work item.

I have checked in workflow log the work item has with first level manger only.

any one please help me on this.

Regards,

Srujan