Hi Dorsa,

To change the default due date for bills in Odoo to the actual date instead of "in 7 days", you'll need to adjust the payment terms associated with your vendors. Payment terms define the payment schedule and due date calculation for bills.

Follow these steps to modify the payment terms:

1. Go to Accounting > Configuration > Payment Terms: Navigate to the payment terms configuration page in Odoo.
2. Select Vendor Payment Terms: Locate the payment term(s) that are currently assigned to your vendors. These terms determine when bills are due.
3. Edit Payment Term: Select the payment term you want to modify and edit its details.
4. Adjust Due Date Calculation: Look for the setting that determines the due date calculation. Typically, this involves specifying a number of days after the bill date. Change this setting to "0 days" or any other value that suits your requirement to set the due date to the actual bill date.
5. Save Changes: Once you've adjusted the payment term, save your changes.
6. Apply Payment Term to Vendors: Ensure that the modified payment term is applied to the vendors for whom you want to set the due date to the actual date.
7. Test: Create a new bill for a vendor with the modified payment term to verify that the due date is now set to the actual bill date.

By adjusting the payment terms associated with your vendors, you can customize the due date calculation for bills in Odoo to match your specific business needs.

Hope it helps.