The error you’re encountering when trying to create a purchase order from Company B to Company A typically indicates an issue with the route configuration for inter-company transactions. Here’s how to address this problem:

1. Check Product Routes Configuration

1. Navigate to Product Configuration:
   • Go to Inventory > Products > Products and select the product in question.
2. Verify Routes:
   • Ensure that the product is configured with the correct routes.
   • In the product form, go to the Inventory tab and check the Routes section. Ensure that the product has the relevant routes configured for inter-company transactions.
3. Check the Route Rules:
   • Go to Inventory > Configuration > Routes and verify the routes for inter-company transactions.
   • Ensure that there is a route for replenishing products from one company to another.

2. Configure Inter-Company Routes

1. Define Inter-Company Transit Locations:
   • Go to Inventory > Configuration > Locations and check if you have the Virtual Locations/Inter-company transit location defined.
   • Ensure this location is correctly set up to handle inter-company transfers.
2. Setup Inter-Company Routes:
   • Navigate to Inventory > Configuration > Routes.
   • Create or update routes to include rules for replenishing products between the companies.
   • Ensure that there are appropriate rules for handling stock between Virtual Locations/Inter-company transit and the actual company warehouses.
3. Verify Route Rules:
   • In the route configuration, ensure that the route for inter-company transactions is set to handle stock movements between the companies.
   • Check for rules like “Pull from Stock” and ensure they are correctly set up for the virtual locations.

3. Check Warehouse Configuration

1. Verify Warehouse Settings:
   • Go to Inventory > Configuration > Warehouses and check if the warehouses for both companies are correctly configured.
   • Ensure that there is a connection between the warehouses and the inter-company transit location.
2. Update Warehouse Locations:
   • Ensure that the warehouses have locations configured to handle inter-company transfers and that they are correctly linked to the virtual locations.

4. Update and Test

1. Update Products and Routes:
   • After making changes, update the products and routes to ensure the new configurations are applied.
2. Test the Process:
   • Create a new purchase order from Company B to Company A and check if the issue is resolved.

5. Additional Considerations

• Check User Permissions: Ensure that the user creating the purchase order has the necessary permissions to perform inter-company transactions.
• Review Logs: Check Odoo logs for any additional error messages or details that might provide more context on the issue.

By reviewing and configuring the product routes, inter-company transit locations, and warehouse settings, you should be able to resolve the error and ensure smooth inter-company transactions. If the issue persists, consider consulting with an Odoo expert or reaching out to Odoo support for further assistance.

Thank you for your answer. Unfortunately this also not working. Chatgpt gave me the same answer too before posting. There is something wrong with the route but cannot find it. The routes are same for both companies, one is working other not.