How site is derived for Expense reports

Hi

We have an employee who has 2 expense reports submitted

When the Expense Report Export request is run these expense reports end in Reject_code=Supplier site is not valid and is not exported to AP as invoice

However when the user logs in from the responsibility from which he submitted his expense report the expense reports show Ready for Payment

From the supplier record of the employee he has 3 sites

Home-OU-X- Active

Home-OU-Y-Inactive (17-Jan-17)

Home-OU-Z-Inactive (17-Jan-17)

The expense report have a invoice date of 05-jan-17 and 21-Dec-17

Questions

--------------

1. How is the site name determined when expense reports are exported to AP as the site id is not visible in tables