id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2557	Report parameters with fixed = true and no binding equations	Francesco Casella	Lennart Ochel	"From Modelica 3.3 specification, Section 8.6:

  If a parameter has a start-expression, does not have fixed=false, 
  and neither has a binding equation nor is part of a record having 
  a binding equation, the start-expression can be used as parameter-
  expression although a diagnostic message is recommended when 
  initializing the model without setting the parameter value

Unfortunately we forgot to port this addition also into Modelica 3.2rev2. Anyway, this is the default behaviour in Dymola, and it is perfectly legal. OpenModelica doesn't take this rule into account, resulting in under-specified initial equation systems that often lead to division-by-zero errors when tackled by the new BLT-based initialization solver.

I would recommend to implement this feature asap, as it can fix many test cases that currently fail to initialize."	defect	closed	critical	1.9.1	Backend	trunk	fixed