I arranged to go out for dinner with my family tomorrow night, but then a customer asked to meet me urgently. I suggested he come along so we could talk business for a while. As there is a business element to this meal now, I assume it will be OK to claim it back on my expenses?
Consult with your manager or the Finance, Ethics or Legal team before making these arrangements. Meals for personal reasons should generally be separated from business ones so that they can be expensed properly. In other words, you should pay for your family meal and the Company can reimburse you for a modest meal with the customer conducted for business purposes.