There should be at least one equipment on duty.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 19.0.0.0 (19.0.0.405)

Syntax

C#
`public static FailureDefinitionId AtLeastOneEquipmentOnDuty { get; }`

Visual Basic
`Public Shared ReadOnly Property AtLeastOneEquipmentOnDuty As FailureDefinitionId Get`

Visual C++
`public: static property FailureDefinitionId^ AtLeastOneEquipmentOnDuty { FailureDefinitionId^ get (); }`

See Also