id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4235	assigning Medium package in replaceable class fails	Michael Wetter	Per Östlund	"Translating various models fail with the message
{{{
Buildings.Fluid.Boilers.Examples.BoilerPolynomial: 28:3-39:70]: component boi1 contains the definition of a partial class Medium.
Please redeclare it to any package compatible with Modelica.Media.Interfaces.PartialMedium.
}}}
or similarly
{{{
[5] 21:45:22 Translation Error
[Buildings.Examples.Tutorial.Boiler.System3: 153:3-160:72]: component boi contains the definition of a partial class Medium.
Please redeclare it to any package compatible with Modelica.Media.Interfaces.PartialMedium.
}}}

The problematic code seems to be in `Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger`:
{{{
 replaceable Buildings.Fluid.MixingVolumes.MixingVolume vol
  constrainedby Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolume(
    redeclare final package Medium = Medium,
    ...
}}}

This is a blocker if users want to use OpenModelica during the tutorial at the MODPROD workshop.

The error from our other tutorial that we could use also seems related as we use a similar construct in the cooling coil: 
{{{
[/var/lib/hudson/jobs/OpenModelica_TEST_ALL_LIBRARIES/workspace/OpenModelica/build/lib/omlibrary/Buildings latest/Fluid/Interfaces/PartialFourPort.mo:4:15-6:45:writable] Notification: From here:
[/var/lib/hudson/jobs/OpenModelica_TEST_ALL_LIBRARIES/workspace/OpenModelica/build/lib/omlibrary/Buildings latest/Examples/Tutorial/SpaceCooling/System2.mo:82:3-100:28:writable] Error: component cooCoi contains the definition of a partial class Medium1.
Please redeclare it to any package compatible with Modelica.Media.Interfaces.PartialMedium.
Error: Error occurred while flattening model Buildings.Examples.Tutorial.SpaceCooling.System2
}}}"	defect	closed	blocker	2.0.0	New Instantiation	v1.12.0	fixed