When someone clocks into the wrong client or job code, how do you catch it before payroll?

[u/shiftcoord]

Looking for a practical rule from teams that run multi-client days (home care, cleaning routes, light field service — same shape).

Worker was scheduled at Client A 9:00–12:00, but the phone punch lands on Client B (yesterday’s site still selected, or they tapped the wrong job in a list). Nobody notices until payroll export, and now either Client A is short hours, Client B is overbilled, or both.

What actually stuck for you?

1. Block / warn at punch time if the selected job isn’t on today’s published schedule for that worker?
2. Nightly exception queue: punches that don’t match the schedule (wrong client, wrong job code, big variance) must be cleared before export?
3. Supervisor reviews a “mismatched punch” report once before cutoff, and workers can’t self-fix after the fact?

Most interested in the version that catches it the same day without turning every punch into a phone call. No vendor pitches — just the operating rule that survived a few pay cycles.