Wait Event in Error in a Class based workflow

Hello Experts,

In my first attempt to create a Class based workflow, I am facing an error while execution of the workflow related to WAIT step.

This is a custom WF being triggered via a custom class event (CREATE) from an ABAP Prog.

Pls. refer to attached doc, for more screenshots relevant here and request your expert advise on what I am doing wrong.

Many Thanks

BR,

Sid