Can't Copy to Clipboard elements from the project and a link instance at the same time. Only elements from the project will be copied.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId CannotCopyFromProjectAndLink { get; }