Time Entry for field service is lacking some basic functionality - submission, review by manager and approval/rejection.

My recommendation would be to have the same functionality within Field Service Time Entry that exists in Project Operations:

• Technician on Mobile can submit time entry / entries for approval by manager. Entry Status = Submitted
• Once submitted, the technician could recall, if NOT approved.
• Once Submitted, the manager reviews:
• If Approved, the entry status = Approved
• If Rejected, the entry status = Returned and the Manager MUST enter a reason why.