I work part-time. Are there special regulations for this?
If you work part-time, receipts may only be submitted on working days (e.g. Monday to Thursday). However, it does not matter how many hours you work on that day.

However, maximum receipt submission will be reduced on a monthly basis if you work less than 5 working days per week (e.g., if you work 5 days per week = 15 receipts per month, if you work 3 days per week = 9 receipts per month).