A: This message indicates that the invoice was created in your accounting software without a due date. One possible cause for this is that when the invoice was created in Steelhead, a due date was not set. 01.01.1970 is a generic default due date for some accounting softwares. Depending on your software, you may see a different date or no date.

A: The customer you are invoicing may not have default terms set in Steelhead. Set Default Terms on the Customer page.