Load form through CC not working

Hi,
I habe a connection with view, edit and delete actions. I copied everything from a connection that works and changed the field names etc. - now any action provokes an error like:

1054 - Unknown column 'Data. IS NULL' in 'where clause' SQL=SELECT `Data`.`id` AS `Data.id`, `Data`.`user_id` AS `Data.user_id`, `Data`.`created` AS `Data.created`, `Data`.`name` AS `Data.name`, `Data`.`gadget` AS `Data.gadget`, `Data`.`ort` AS `Data.ort`, `Data`.`model` AS `Data.model`, `Data`.`details` AS `Data.details`, `Data`.`available` AS `Data.available`, `Data`.`time_standard` AS `Data.time_standard`, `Data`.`time_long` AS `Data.time_long`, `Data`.`kaution` AS `Data.kaution`, `Data`.`pfand` AS `Data.pfand`, `Data`.`price-details` AS `Data.price-details`, `Data`.`contact` AS `Data.contact`, `Data`.`contact-info` AS `Data.contact-info`, `Data`.`contact-details` AS `Data.contact-details` FROM `kwm_gadgets` AS `Data` WHERE `Data`.` IS NULL

It seems the condition (id or something) is not received. In fact, the url looks like

index.php/geraete-teilen/geraet-leihen?cont=lists&ccname=Geraet_leihen&act=view 

and not like (working connection)

index.php/carsharing/auto-leihen?cont=lists&ccname=Auto_leihen&act=view&gcb=3

But adding "&gcb=0" manually doesn't have an effect.
What's the problem here?
Thanks in advance.
Christian

Can anybody help me out? I tried a lot but I still have no idea.