I've got this error:

   ** Severe  ** WaterHeater:HeatPump:WrappedCondenser = PLANTHEATPUMPWATERHEATER:
   **   ~~~   ** Heater Control Type for WaterHeater:Stratified = WATER HEATER TANK must be CYCLE.

on a fairly simple model, where I have I think completely copied the heat pump water heater components from the WaterHeaterHeatPumpWrappedCondensor example file (which has both a wrapped condenser heater and a stratified water heater tank, just like my model). This is why this error is confusing me, because it says the tank must have a cycle control, but that is only available in a WaterHeater:Mixed, not a WaterHeater:Stratefied - and somehow this combination is working fine int he example file. I wasn't able to find anything explaining the requirement in the documentation, so I'm at a bit of a loss. Any idea what might trigger this requirement in the heat pump settings or somewhere else? Just in case, here is my full text for those two objects:

WaterHeater:Stratified,
    Water Heater Tank,       !- Name
    Water Heater,            !- End-Use Subcategory
    0.287691,                !- Tank Volume {m3}
    1.594,                   !- Tank Height {m}
    VerticalCylinder,        !- Tank Shape
    ,                        !- Tank Perimeter {m}
    100,                     !- Maximum Temperature Limit {C}
    Simultaneous,            !- Heater Priority Control
    WaterHeaterElec Setpoint Temp,  !- Heater 1 Setpoint Temperature Schedule Name
    18.5,                    !- Heater 1 Deadband Temperature Difference {deltaC}
    4500,                    !- Heater 1 Capacity {W}
    1.129,                   !- Heater 1 Height {m}
    WaterHeaterElec Setpoint Temp,  !- Heater 2 Setpoint Temperature Schedule Name
    18.5,                    !- Heater 2 Deadband Temperature Difference {deltaC}
    0,                       !- Heater 2 Capacity {W}
    0.266,                   !- Heater 2 Height {m}
    Electricity,             !- Heater Fuel Type
    1,                       !- Heater Thermal Efficiency
    8.3,                     !- Off Cycle Parasitic Fuel Consumption Rate {W}
    Electricity,             !- Off Cycle Parasitic Fuel Type
    0,                       !- Off Cycle Parasitic Heat Fraction to Tank
    1,                       !- Off Cycle Parasitic Height {m}
    8.3,                     !- On Cycle Parasitic Fuel Consumption Rate {W}
    Electricity,             !- On Cycle Parasitic Fuel Type
    0,                       !- On Cycle Parasitic Heat Fraction to Tank
    1,                       !- On Cycle Parasitic Height {m}
    Zone,                    !- Ambient Temperature Indicator
    ,                        !- Ambient Temperature Schedule Name
    CorridorFlr2 Thermal Zone,  !- Ambient Temperature Zone Name
    ,                        !- Ambient Temperature Outdoor Air Node Name
    0.7878,                  !- Uniform Skin Loss Coefficient per Unit Area to Ambient Temperature {W/m2-K}
    1,                       !- Skin Loss Fraction to Zone
    ,                        !- Off Cycle Flue Loss Coefficient to Ambient Temperature {W/K}
    1,                       !- Off Cycle Flue Loss Fraction to Zone
    ,                        !- Peak Use Flow Rate {m3/s}
    ,                        !- Use Flow Rate Fraction Schedule Name
    ,                        !- Cold Water Supply Temperature Schedule Name
    Water Heater Use Inlet Node,  !- Use Side Inlet Node Name
    Water Heater Use Outlet Node,  !- Use Side Outlet Node Name
    1,                       !- Use Side Effectiveness
    0,                       !- Use Side Inlet Height {m}
    autocalculate,           !- Use Side Outlet Height {m}
    ,                        !- Source Side Inlet Node Name
    ,                        !- Source Side Outlet Node Name
    ,                        !- Source Side Effectiveness
    ,                        !- Source Side Inlet Height {m}
    ,                        !- Source Side Outlet Height {m}
    Fixed,                   !- Inlet Mode
    autosize,                !- Use Side Design Flow Rate {m3/s}
    autosize,                !- Source Side Design Flow Rate {m3/s}
    1.5,                     !- Indirect Water Heating Recovery Time {hr}
    12;                      !- Number of Nodes

WaterHeater:HeatPump:WrappedCondenser,
    PlantHeatPumpWaterHeater,!- Name
    ,                        !- Availability Schedule Name
    WaterHeaterGas Setpoint Temp,  !- Compressor Setpoint Temperature Schedule Name
    3.89,                    !- Dead Band Temperature Difference {deltaC}
    0.0664166667,            !- Condenser Bottom Location {m}
    0.8634166667,            !- Condenser Top Location {m}
    0.2279,                  !- Evaporator Air Flow Rate {m3/s}
    OutdoorAirOnly,          !- Inlet Air Configuration
    ,                        !- Air Inlet Node Name
    ,                        !- Air Outlet Node Name
    HPPlantAirInletNode,     !- Outdoor Air Node Name
    HPPlantFanAirOutletNode, !- Exhaust Air Node Name
    ,                        !- Inlet Air Temperature Schedule Name
    ,                        !- Inlet Air Humidity Schedule Name
    ,                        !- Inlet Air Zone Name
    WaterHeater:Stratified,  !- Tank Object Type
    Water Heater Tank,       !- Tank Name
    Water Heater Use Inlet Node,  !- Tank Use Side Inlet Node Name
    Water Heater Use Outlet Node,  !- Tank Use Side Outlet Node Name
    Coil:WaterHeating:AirToWaterHeatPump:Wrapped,  !- DX Coil Object Type
    HPWHPlantDXCoil,         !- DX Coil Name
    7.2,                     !- Minimum Inlet Air Temperature for Compressor Operation {C}
    48.89,                   !- Maximum Inlet Air Temperature for Compressor Operation {C}
    Outdoors,                !- Compressor Location
    ,                        !- Compressor Ambient Temperature Schedule Name
    Fan:SystemModel,         !- Fan Object Type
    HPWHFan,                 !- Fan Name
    DrawThrough,             !- Fan Placement
    0,                       !- On Cycle Parasitic Electric Load {W}
    0,                       !- Off Cycle Parasitic Electric Load {W}
    ,                        !- Parasitic Heat Rejection Location
    ,                        !- Inlet Air Mixer Node Name
    ,                        !- Outlet Air Splitter Node Name
    ,                        !- Inlet Air Mixer Schedule Name
    MutuallyExclusive,       !- Tank Element Control Logic
    1.262,                   !- Control Sensor 1 Height In Stratified Tank {m}
    0.75,                    !- Control Sensor 1 Weight {dimensionless}
    0.464;                   !- Control Sensor 2 Height In Stratified Tank {m}