You cannot create an invoice without a customer number. This is true, even if you make a cash sale and do not have anything to record in a customer account.
On the Invoicing FastTab, fill in the Customer Posting Group and the Gen. Bus. Posting Group fields.
Now you have set up a customer that contains sufficient information for invoicing.
You may have chosen a posting group that is also used for domestic credit sales. If you want to maintain separate data on cash sales, for example, with a special sales or receivables account, you can set up an extra posting group for this purpose.
You must enter a number for a receivables account for the posting group, even though the balance in this account will always be 0 after you post an invoice.
Managing Receivables
How to: Register New Customers
Finance
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