This is a system warning that is displayed to let you know that by changing these you’ll lose the original application information such as solicitors and/or recognition credits.  This is due to the way BBEC records pledge history regarding designations and solicitor information.  It’s not stating you can’t edit the designation, but merely warning that you may want to record this information in case you need it for your records, etc.

More information can be found in our BBEC Revenue User Guide:
http://www.blackbaud.com/files/support/guides/enterprise/revenue.pdf