Best practice for workflow triggering from Web Dynpro UI

Question

Hello, workflow community!
I'm working on a task which allow to trigger the workflow by clicking a button in Web Dynpro UI. As always, there are multiple ways to do that, for instance, to use SAP Workflow API (SAP_WAPI_START_WORKFLOW) or to raise an event upon the button click, which will be caught by workflow template.
In my opinion, the optimal solution is to call FM, which will call ABAP-class, raising an event, which, in turn, will be caught by workflow template. In this case, FM will service kind of wrapper, where we can implement some additional checks if needed.
But the question is what approach is the best practice — to raise an event or use SAP_WAPI_*?
Thanks.

Answer 1

let combine, use SAP_WAPI_CREATE_EVENT
usually I would not recommend creating a workflow directly (SAP_WAPI_START_WORKFLOW) since when I look for workflows in a system I usually start from SWE2 (the event linkage) which uses events so the workflow you start by SAP_WAPI_START_WORKFLOW will not be seen there, also SWE2 gives you better control for starting the workflow, you can easily deactivate an event linkage. finding where you called the workflow by SAP_WAPI_START_WORKFLOW will be more difficult and deactivation will require a code change.
so use events, and start them by SAP_WAPI_CREATE_EVENT
Also pay attention that you have a check function module option in SWE2.