'You already applied a discount code' error

Issue

The error message You already applied a discount code appears after attempting to process a bulk discount application. 

Environment

Cause

If a customer's address ID already has a discount code applied, running a bulk discount application will result in an error for those addresses after processing. 

Resolution

To resolve the error you must do one of the following:

1. Remove the addresses with the error from the file and reprocess the update.
2. Manually or bulk remove the discount codes from the addresses with the error and try the bulk update again.