Option 1
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Right click on the customer tab and choose open in a new tab
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Enter the new customer
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Return to the invoice tab and hopefully you can then select the customer you just entered
Option 2
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Enter a generic Walk in customer
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If you find new customer has not been entered, select the generic customer
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If desired then go to customer tab to enter specific customer
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return to the invoice and update the customer field by selecting the specific customer
For discussion on program changes see this idea New Customer - Lookup Feature