Meridian hybrid documents are multiple files that are treated as one document by Meridian commands. To edit any one part of a hybrid document, the main part must be placed in a workflow. Only then can a part be edited.
Hybrid document types are often used to manage hybrid drawings, but they can also be used for other documents that should be treated as one document but stored as separate files. Hybrid document types are not enabled by default. Consult a system administrator for the names, associated file types, and purposes of hybrid document types in your vaults.