Warning: Not licensed to edit layers with relationship classes

This layer is related to another layer by a relationship class and cannot be edited with an ArcView license.

Solution: Upgrade your license to ArcEditor or ArcInfo.

More information: With an ArcView license, you receive this error when you attempt to start editing a feature class that is related to another feature class or table. In addition, it appears if you attempt to edit feature-linked annotation, since a relationship class is used to maintain the link between the origin feature and its annotation. It can also appear if you try to start editing data that has attachments, since a relationship class links the attached files to the attributes.