Error occurred when changing value description of marketing attributes

Hi,

I'd like to change description of an attribute value in marketing attribute, but when click save button, it will shows following error message:

The values currently maintained lead to inconsistencies in the database

Message no. CRM_MKTPF_PFMERK053

Diagnosis

You may not delete values that are already assigned to a business partner. If you want to assign pre-defined values to an attribute that formerly had freely-definable text, you must include all values that have already been assigned to a business partner. Otherwise the values cannot be saved or you have to delete the values for this attribute from the business partners.

So how can I change the description of an attribute value?

Thanks and Best regards,

Long