Click Accounts receivable> Setup> Sales order> Returns> Return reason codes

–or–

Accounts receivable> Setup> Sales order> Returns> Return reason code groups > Return reason codes.

Press CTRL + N to create a new reason return code line.

In the Return reason codefield, enter text to identify this code.

In the Descriptionfield, enter text to describe this reason return code.

Use the Return reason code grouplist to add this code to a reason return code group.