The error message "Cannot place this family. It can only be placed in plan views and RCPs" is explicit. Annotation families are 2D, view-specific elements. Within the Revit Family Editor, they cannot be placed in 3D views. The designer must switch to a 2D plan view to place the annotation. The "Ref. Level" is the primary floor plan view in the family editor environment and is the correct location for placing plan-view symbols.

A. Changing the Detail Level (Coarse, Medium, Fine) affects the visibility of geometry, not the type of view, and will not resolve the placement error.

B. Setting a family to "Shared" affects its behavior in a project (e.g., scheduling), not its placement constraints within the host family editor.

D. The "Maintain Annotation Orientation" parameter controls how the symbol rotates, not in which view type it can be placed.

1. Autodesk, Inc. (2023). Revit 2024 Help: Create a Family with a Nested and Shared Component. Autodesk Knowledge Network. Retrieved from https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-99E4A237-E613-4209-A895-504E5A5C954C. Step 4 notes, "In the Project Browser, under Floor Plans, double-click Ref. Level... to place the annotation symbol."

2. Autodesk, Inc. (2023). Revit 2024 Help: About the Family Editor. Autodesk Knowledge Network. Retrieved from https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-B3754190-1954-4352-8236-18C86AB24521. This document describes the Family Editor environment, which includes different views like plan (Ref. Level) and 3D views.