Thanks Sandra for quick reply. I am putting step by step what I have done till now and what my requirement is.
1. I have one Smartform and that needs to be attached as PDF. User will click on Save Button and workflow is getting triggered for Approval. In that I need Attachment in Workitem where user view the attached attachment and gives his/her decision. So I need PDF as Attachment in Usage Decision.
2. I Google and could find the way to attach attachment . like if u could see in below link.
Sending multiple attachment in user decision step of workflow
I am using CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME where I will convert into Binary Data and attach it to _ATTACH_OBJECT. But I am not able to go further what steps I need to take .
Please help me in this or let me know if you are aware of different approach .
Thanks