Thank you for your answer in detail, I totally agree w/ you.
I like movie example 
but, we have a specific valid/genuine reason that after sending out WIs, we need to disallow some users
Thank you for providing more filter options for making sure, but
1) The moment user selects the WI & clicks the ACCEPT button, ny break-point will trigger and debugger opens, here I got/saw the 2 entries as output/return from the FM 'SWI_GET_RELATED_WORKITEMS', 1st entry of type 'W' but its WI_STATUS is READY and WI_AGENT is blank (now, opening a new session I also checked the said table SWWWIHEAD-WI_AAGENT, here also blank). 2nd entry is 'B' type.
I'm simply reading the 'W' type entry and passing this WI_ID to FM of RESUBMIT
Pls. let me know is it OK / safe, I mean, not filtering just resubmitting based on WI_TYPE?
Regards