Need All HCM FORM fields in my workflow container

Hi Experts,

I am developing a workflow for creation of org unit or Position from FPM form. In last step of my workflow I have to write a custom task to create org unit or position in background infotypes with form fields.

In workflow i am geting only few fields from FPM form via PROCESS_OBJECT. Then I tried to import form field in my workflow container via standard task TS17900110, but there is a problem with this standard task that I can pull maximum 3 fields to my WF container.

If any body knows any other stadard task or any logic to get all form fields in my workflow, it will be great help.