I had this issue when syncing a configuration on one of my projects:
"You can resolve this warning by reserializing the master:/sitecore/content/Modules/Links/Charts/Chart 1/Symptoms/Results item, or manually removing the deleted field value from the serialized item."
this message got me thinking. I know I can reserialize the whole configuration and all items of it get reserialized but do it for just a single item I wouldn`t know how to do it. anyone knows?