If the "Same as Billing" check box is enabled, error messages are displayed once a customer fills in information and checks the "same as billing" box. If the same customer information is entered a second time, it now goes through.
No error messages are received if customer is forced to reenter information into shipping fields.
I could live with it, but I need to sell services (no product sent) so forcing customers to enter shipping address is confusing for them.
Any ideas?