altering values for List (text) error: Allowed values list: some values are being removed while currently in use

Question

I have a drupal 7 site with content type that has a field of type List (text) and widget is Select list, I wanted to alter the allowed values but unable to because I keep getting an error: Allowed values list: some values are being removed while currently in use.

What do you suggest? maybe change it through PHPmyadmin for existing nodes?

Answer 1

If data is not much delete the field values entered earlier and then alter the allowed values. After that you can reenter the the field values added.