Wrong validator regex for customer number template
Due an error in the validator regex it's not possible to enter a customer number prefix like "K2014[CUSTOMER_NO]"
web/admin/form/system_config.tform.php - Line 452 have to be: 'regex' => '/^[a-zA-Z0-9-_[]]{0,50}$/',
And not 'regex' => '/^[a-zA-Z0-0-_[]]{0,50}$/',
(change 0-0 to 0-9)