[TYPO3-english] Extbase: selectMultipleSideBySide allow item mutiple times

Hello, I need a selectMultipleSideBySide that allows an item multiple times. I added the option 'multiple' => 1 and extended the mm table with the field uid like descripted here: https://docs.typo3.org/typo3cms/TCAReference/ColumnsConfig/Type/Select.html#id103 In the backend everything works

[TYPO3-english] Preventing a record to be saved if the BE user input value was undesired?

I want to prevent a BE user from inputting undesired property values for records, let's say for the property IPv4. I wrote an evaluation class for this: class IPv4Evaluation { /** * @param string $value * @param string $is_in * @param bool $set

[TYPO3-english] caldav extension not working

Hello Forum, I'm trying to setup the caldav extension, but caldav.php fails running with the error: Fatal error: Class 'TYPO3\CMS\Core\Core\ApplicationContext' not found in /usr/local/share/typo3_src-7.6.15/typo3/sysext/core/Classes/Core/Bootstrap.php on line 90 I've followed the all the