id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1220	PointGravityWithPointMasses and PointGravityWithPointMasses2 has assertions with false condidion in the flat code.	Peter Aronsson	Peter Aronsson	"This is clearly wrong:

{{{OpenModelica/testsuite/libraries/multibody/elementary
$ grep assert\(false *.mos
PointGravityWithPointMasses.mos:// assert(false,""
PointGravityWithPointMasses.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""
PointGravityWithPointMasses2.mos:// assert(false,""}}}

I do not know why this occur, but it originates from 
{{{ if Connections.isRoot(frame_a.R) then
     assert(cardinality(frame_a)==0, ""
A Modelica.Mechanics.MultiBody.Parts.PointMass model is connected in
a way, so that no equations are present to compute frame_a.R
(the orientation object in the connector). Setting frame_a.R to
an arbitrary value in the PointMass model, might lead to a wrong
overall model, depending on how the PointMass model is used.
   You can avoid this message, by providing equations that
compute the orientation object, e.g., by using the
Modelica.Mechanics.MultiBody.Joints.FreeMotion joint.
   If a PointMass model is not connected at all, the
orientation object is set to a unit rotation. But this is
the only case where this is done.
"");
     frame_a.R = Frames.nullRotation();
  else
     frame_a.t = zeros(3);
  end if;}}}

So my guess is that it has something to do with either cardinality or connection breaking, or both!"	defect	closed	blocker				worksforme		Peter Aronsson