Change dinamically a formula in the report

I need to change a formula dinamically
So I'm doing this (some try catch omitted but presents), just to try I'm replacing ALL of formulas to string '1';
                    Fields<IFormulaField> formulas = null;
                                             formulas = myRpt.getDataDefinition().getFormulaFields();
IFormulaField formula = null;
                    for (int f = 0; f < formulas.size(); f++)
                              formula = myRpt.getDataDefinition().getFormulaFields().get(f);
                                                            String oldText = formula.getText();
                              String newText = new String("1");
                                                               formula.setText(newText);
But report actually go on using the OLD formula text... Why?

You need to use the FormulaFieldController.modify method.

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Change dinamically a formula in the report

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