873 ERROR All specified account numbers must match [Solution]

When processing orders you might come across the "873 ERROR All specified account numbers must match" error.

This is show when the Billing Account you're trying to use to process the order is misconfigured on the Client level.

Feel free to follow the step-by-step guide written below or the video guide, as you prefer:

To solve this issue you will have to:

1. Access Clients under the Maintenance menu
   
   
   
   
2. Click on the client related to the order
   
   
3. Edit the Billing Account related to the order and error
   
   
   
   
4. Select the Carrier Options tab
   
   
5. Correct the account number (and mode if necessary) making sure the number matches with the account you requested to be set up for that Carrier
   
   
   
6. Press Save to apply the changes