Cancel A/R reserve invoice with zero ammount

Hi Experts,

My customer post AR invoices so the warehouse people can look at all open reserve invoices and copy them to delivery when the shipping occurs.

My issue is, when creating an AR reserve invoice with zero amount, there is no option to copy it to a credit memo and the order stays open.

Does anyone know how that can be canceled so the warehouse people will not see the zero amount invoice?

Thanks,

Oren