1100201 Account Number is Invalid. Shipping Error. [Solution]

When processing an order, you might come across the "1100201 Account Number is Invalid. Shipping Error." error. 

This error is shown when the Account number has been set up incorrectly in the Billing Account through which you are trying to process the order.

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 Billing Account # field information, either adding it if empty, or fixing it if already there
   
   
6. Press Save to apply the changes