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It looks like this is a bug in OpenStudio where the available inputs for the OS:PlantLoop field "Load Distribution Scheme" in the OpenStudio input data dictionary file don't match those in the EnergyPlus idd. The OS inputs available are:

A15, \field Load Distribution Scheme
   \type choice
   \required-field
   \key Optimal
   \key Sequential
   \key Uniform

while the EnergyPlus ones are:

A14, \field Load Distribution Scheme
    \type choice
    \key Optimal
    \key SequentialLoad
    \key UniformLoad
    \key UniformPLR
    \key SequentialUniformPLR
    \default SequentialLoad

OpenStudio is just taking the string "Uniform" and setting that as the idf input (here), but since EnergyPlus isn't expecting that as an available choice, you get the 'Invalid Choice' warning.

It looks like this is a bug in OpenStudio where the available inputs for the OS:PlantLoop field "Load Distribution Scheme" in the OpenStudio input data dictionary file don't match those in the EnergyPlus idd. The OS inputs available are:

A15, \field Load Distribution Scheme
   \type choice
   \required-field
   \key Optimal
   \key Sequential
   \key Uniform

while the EnergyPlus ones are:

A14, \field Load Distribution Scheme
    \type choice
    \key Optimal
    \key SequentialLoad
    \key UniformLoad
    \key UniformPLR
    \key SequentialUniformPLR
    \default SequentialLoad

OpenStudio is just taking the string "Uniform" and setting that as the idf input (here), but since EnergyPlus isn't expecting that as an available choice, you get the 'Invalid Choice' warning.

It looks like this is a bug in OpenStudio where the available inputs for the OS:PlantLoop field "Load Distribution Scheme" in the OpenStudio input data dictionary file don't match those in the EnergyPlus idd. The OS inputs available are:

A15, \field Load Distribution Scheme
   \type choice
   \required-field
   \key Optimal
   \key Sequential
   \key Uniform

while the EnergyPlus ones are:

A14, \field Load Distribution Scheme
    \type choice
    \key Optimal
    \key SequentialLoad
    \key UniformLoad
    \key UniformPLR
    \key SequentialUniformPLR
    \default SequentialLoad

OpenStudio is just taking the string choice "Uniform" and setting that as the idf input (here), but since EnergyPlus isn't expecting that as an available choice, you get the 'Invalid Choice' warning.

@Kyle Benne do you know about this?