parameter unable to change through _ini.xml in OpenModelica - modelica

Question

my intention is to change a parameter of a component through the _init.xml:
The model is declared as:
model ModelA
...
parameter Types.ActivePower PRefConst = 0
...
Types.ActivePower PRef(nominal = SNom) = PRefConst
...
end ModelA;
During the instantiation of ModelA, the PRefConst is assigned to a value:
model_a ModelA(..., PRefConst = 14.9e6, ...);
In the compiled C code, it can be noticed that the PRefConst's value is assigned hard-coded:
/*
equation index: 6068
type: SIMPLE_ASSIGN
model_a .PRefConst = 14900000.0
*/
void modelName_eqFunction_6068(DATA *data, threadData_t *threadData)
{
TRACE_PUSH
const int equationIndexes[2] = {1,6068};
data->simulationInfo->realParameter[1565] /* model_a .PRefConst PARAM */ = 14900000.0;
TRACE_POP
}
/*
equation index: 6067
type: SIMPLE_ASSIGN
model_a .PRef = model_a .PRefConst
*/
void modelName_eqFunction_6067(DATA *data, threadData_t *threadData)
{
TRACE_PUSH
const int equationIndexes[2] = {1,6067};
data->simulationInfo->realParameter[1564] /* model_a .PRef PARAM */ = data->simulationInfo->realParameter[1565] /* model_a .PRefConst PARAM */;
TRACE_POP
}
So that even I chang the value of PRefConst in the _init.xml file, in the end the simulation result shows that even though the PRefConst is correctly changed, however the value of PRef is still 14900000.0, because it is already assigned by the original PRefConst's value in the C code. How can I avoid this? Maybe through some options in preOptModules or postOptModules?
My current preOptModules is set to
setPreOptModules("normalInlineFunction,expandDerOperator,clockPartitioning,findStateOrder,inlineArrayEqn,encapsulateWhenConditions")