Solve First Save issue

[franhida]

In order to solve the First Save issue, you could force a reload of the field (which triggers an entity save) as follows in Configuration/TCA/tx_samlauthentication_domain_model_tablemapping.php:

 'table' => [
    'exclude' => false,
    'label' => 'LLL:EXT:samlauthentication/Resources/Private/Language/locallang.xlf:tableMapping.table',
    'config' => [
    'type' => 'select',
    'itemsProcFunc' => 'DanielPfeil\\Samlauthentication\\Utility\\BackendUtility->getTables',
       'renderType' => 'selectSingle',
    ],
    'onChange' => 'reload'
 ],

You can review the use of the onChange property in the documentation.

Reminder

This change DOES NOT fully fixes the error since the reload is triggered when the value of the select changes.
If the value of the select is the selected by default the save will not be triggered.

Sincerely,
franhida.