Program: 112289
Project: 112289
Buggy source:
private static void populateDetails(FhirContext theCtx,IBase theIssue,String theSeverity,String theDetails,String theLocation){
  BaseRuntimeElementCompositeDefinition<?> issueElement=(BaseRuntimeElementCompositeDefinition<?>)theCtx.getElementDefinition(theIssue.getClass());
  BaseRuntimeChildDefinition detailsChild;
  if (theCtx.getVersion().getVersion().isNewerThan(FhirVersionEnum.DSTU1)) {
    detailsChild=issueElement.getChildByName("String_Node_Str");
  }
 else {
    detailsChild=issueElement.getChildByName("String_Node_Str");
  }
  BaseRuntimeElementDefinition<?> stringDef=theCtx.getElementDefinition("String_Node_Str");
  BaseRuntimeChildDefinition severityChild=issueElement.getChildByName("String_Node_Str");
  BaseRuntimeChildDefinition locationChild=issueElement.getChildByName("String_Node_Str");
  IPrimitiveType<?> severityElem=(IPrimitiveType<?>)severityChild.getChildByName("String_Node_Str").newInstance(severityChild.getInstanceConstructorArguments());
  severityElem.setValueAsString(theSeverity);
  severityChild.getMutator().addValue(theIssue,severityElem);
  IPrimitiveType<?> string=(IPrimitiveType<?>)stringDef.newInstance();
  string.setValueAsString(theDetails);
  detailsChild.getMutator().setValue(theIssue,string);
  if (isNotBlank(theLocation)) {
    IPrimitiveType<?> locationElem=(IPrimitiveType<?>)locationChild.getChildByName("String_Node_Str").newInstance(locationChild.getInstanceConstructorArguments());
    locationElem.setValueAsString(theLocation);
    locationChild.getMutator().addValue(theIssue,locationElem);
  }
}

Fixed version (ground truth):
private static void populateDetails(FhirContext theCtx,IBase theIssue,String theSeverity,String theDetails,String theLocation,String theCode){
  BaseRuntimeElementCompositeDefinition<?> issueElement=(BaseRuntimeElementCompositeDefinition<?>)theCtx.getElementDefinition(theIssue.getClass());
  BaseRuntimeChildDefinition detailsChild;
  if (theCtx.getVersion().getVersion().isNewerThan(FhirVersionEnum.DSTU1)) {
    detailsChild=issueElement.getChildByName("String_Node_Str");
    BaseRuntimeChildDefinition codeChild=issueElement.getChildByName("String_Node_Str");
    IPrimitiveType<?> codeElem=(IPrimitiveType<?>)codeChild.getChildByName("String_Node_Str").newInstance(codeChild.getInstanceConstructorArguments());
    codeElem.setValueAsString(theCode);
    codeChild.getMutator().addValue(theIssue,codeElem);
  }
 else {
    detailsChild=issueElement.getChildByName("String_Node_Str");
  }
  BaseRuntimeElementDefinition<?> stringDef=theCtx.getElementDefinition("String_Node_Str");
  BaseRuntimeChildDefinition severityChild=issueElement.getChildByName("String_Node_Str");
  BaseRuntimeChildDefinition locationChild=issueElement.getChildByName("String_Node_Str");
  IPrimitiveType<?> severityElem=(IPrimitiveType<?>)severityChild.getChildByName("String_Node_Str").newInstance(severityChild.getInstanceConstructorArguments());
  severityElem.setValueAsString(theSeverity);
  severityChild.getMutator().addValue(theIssue,severityElem);
  IPrimitiveType<?> string=(IPrimitiveType<?>)stringDef.newInstance();
  string.setValueAsString(theDetails);
  detailsChild.getMutator().setValue(theIssue,string);
  if (isNotBlank(theLocation)) {
    IPrimitiveType<?> locationElem=(IPrimitiveType<?>)locationChild.getChildByName("String_Node_Str").newInstance(locationChild.getInstanceConstructorArguments());
    locationElem.setValueAsString(theLocation);
    locationChild.getMutator().addValue(theIssue,locationElem);
  }
}