Dear Experts,
I'd like to select a timesheet approver in Fiori App "My Timesheet" with task TS31000004, but it not work.
I found in following link that Web Dynpro is not support manual selection of recipient.
Is it support recipient selection in Fiori?
Reference:
Standard Task TS31000004: CATS Approval - Workflow: Approve Working Times (CATS) - SAP Library
The 
CATS regular/Record Working Times (Web Dynpro) Web application does not yet support manual selection of a recipient.
Regards,
Chad