@JBatelli That's probably the case with Iberdrola. Normally (as I know it), however, cash dividends are the standard and stock dividends are optional. So you only had to worry if you wanted shares and not cash.
@DividendenWaschbaer He has probably received subscription rights, which are normally simply converted. For a share distribution, you must also have enough dividends including taxes. There are no half shares to distribute