Dear Friends
We using Flexible workflow for purchase order, which is working fine, but after we upgrade our S4 from 1709 to 2021, and upgrade the component UIBAS001 of frontend system from 300 to 700. It will raise an error 'The user is vaild' when we try to add user as recipient in the approval step. I had check the notes, and it is not helping, so if anyone had come across this issue, please help,Thanks!

Sincerely
Kevin