This is more a workaround report as a bug report. In our corporate document I was not able to change a formula particular in a particular cell/column. saldoCell.setCellFormula("H1"); //this did not work However it workes after I deleted the formula from cell: saldoCell.setCellFormula(null); saldoCell.setCellFormula("H1"); //this worked I am not expert on Excell, but surely it can be helpful for someone in similar situation. If you would like to have a closer look on this issue, I could provide you with the file, but I can not make it public, I guess.
Can you maybe provide a sample document and a unit-test which reproduces the problem? This would make it much easier for others to take a look and see if there is a fix possible.