AUTOINVOICE DATE

For invoices without Rules:
AutoInvoice first uses the GL date in the interface table (RA_INTERFACE_LINES_ALL), if one exists.
If one does not exist then it is derived as follows:
If the Derive Date box is checked for your batch source (Menu: Setup>Transactions>Sources, query your batch source, alternate region Accounting), AutoInvoice first uses the ship date in the interface table. If the ship date does not exist, AutoInvoice uses the sales order date. If the sales order date does not exist, AutoInvoice uses the date entered in the Submit Request window when AutoInvoice was run.

If the Derive Date box is not checked for your batch source, AutoInvoice uses the date entered in the Submit Request window when AutoInvoice was run.

For Invoices with Rules:
AutoInvoice first uses the GL date in the interface table  (RA_INTERFACE_LINES_ALL), if one exists.

• If the Invoicing Rule is 'Bill In Advance', AutoInvoice uses the Rule Start Date for the GL date. 
• If the Invoicing Rule is 'Bill in Arrears' and the invoice line has an accounting rule of type 'Accounting, Fixed Duration' and a period of 'Specific Date', AutoInvoice computes an end date using the earliest  accounting rule date. 
• For all other Accounting rules, AutoInvoice computes an ending date for each invoice line, and then takes the earliest date of these lines and uses it as the GL date of the invoice. 

If your invoice does not use a fixed rule accounting duration and the rule start date is not provided in the interface table, GL date is derived as follows:
If the Derive Date box is checked in batch source options, AutoInvoice first uses the ship date. If the ship date does not exist, AutoInvoice uses the sales order date. If the sales order date does not exist, AutoInvoice uses the date entered in the Submit Request window.
If the Derive Date box is not checked, AutoInvoice uses the date entered in the Submit Request window.