How is inventory Site is being programmed in the AR Standard invoice for Bill Only Orders

Auto Accounting Rule has Site with Standard Lines as Value Source.

However, an item is configured with 3 Inventory Organizations- CSI (000), MX2 (402) and DSI (403) under Product Information Management> Manage Items.

We are using Bill Only sales order type that has no warehouse attribute in Supply. As we have sales revenue account set at Org level in item management control.

The Sales Revenue account has the above sites based on Inventory organization. If no Sales Revenue account has mapped

, the site is populated as Default (000) based on Auto Accounting Rule (which is expected).