How to attach rejection reason captured explicitly as an attachment to decision step ?

Hello,

I am working on approval workflow. I am NOT using standard decision object DECISION, so i have captured rejection reason explicitly in an internal table through popup. Now i want to pass this internal table as an attachment in a user decision step. How to do it?

I know i have to populate it in SOFM business object, but don't know exact details which need to be filled.

Regards,

Nitish