A Manifest relationship indicates that the Artifact source embodies the target model element, typically in Component and Deployment diagrams. Stereotypes can be added to Enterprise Architect to classify the type of manifestation of the model element.
OMG UML Specification
The OMG UML specification (UML Superstructure Specification, v2.1.1, p. 212) states:
An artifact embodies or manifests a number of model elements. The artifact owns the manifestations, each representing the utilization of a packageable element.
Specific profiles are expected to stereotype the manifestation relationship to indicate particular forms of manifestation, e.g. «tool generated» and «custom code» might be two manifestations for different classes embodied in an artifact.