TYPO3 Core

Steps to reproduce:

1. Install the "seminars" extension.
2. Create a non-admin BE user who is allowed to create organizer and event records.
3. Log in as/sudo to that BE user.
4. Create an organizer record and save/close it.
5. Create a seminar record, enter a title and assign the organizer.
6. Save it.

This error message is displayed (although the rest of the data is saved okay):

102: These fields are not properly updated in database:
(price_regular_early,price_regular_board,price_special,price_special_early,price_special_board)
Probably value mismatch with fieldtype.

These fields are hidden and defined like this in SQL and TCA:

price_regular decimal(7,2) DEFAULT '0.00' NOT NULL,

'price_regular' => array(
            'exclude' => 1,
            'label' => 'LLL:EXT:seminars/locallang_db.xml:tx_seminars_seminars.price_regular',
            'config' => array(
                'type' => 'input',
                'size' => '8',
                'max' => '8',
                'eval' => 'double2',
                'checkbox' => '0.00',
                'range' => array(
                    'upper' => '99999.99',
                    'lower' => '0'
                ),
                'default' => 0
            )
        ),

I guess that the problem is that hidden excludefields are saved to an empty string by default (this is a guess), which isn't a valid value for DECIMAL.

This might be related to bug 6194.
(issue imported from #M9016)