After here is the situation. I had a customer pre-pay for fertilization at the beginning of the year. So she has the credit for all 5 fertilizations during the year. BUt she recently inquired about overseeding in which I performed the service. The problem is when I try to bill her for the service, it brings her credit forward from her pre-payment so it's basically showing that she doesn't owe anything.
How can I bill her for the overseeding without having that pre-payment credit come forward and pay for the service?
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