I need to approve / reject the workflow using a FM from the custom screen. I followed the below link where the question is already answered.
https://answers.sap.com/questions/13281173/flexi-workflow-reject-work-item-using-fm-sap-wapi.html
but the Questioner has not answered how he solved the issue with example or detailed parameter value on how to call the FM.
can anyone suggest with the example please.