[TYPO3-mvc] Tx_Extbase_Persistence_Exception

[Daniel Dimitrov]

Ok several questions then! Why is the products (without relation to the 
supplier) working with lowercased filenames?
Something else, my controller, model and repository they were all 
lowercased.
Anyway I have changed everything to Uppercase and the same error displays:

Tx_Extbase_Persistence_Exception
Could not determine a Data Map for given class name.
(it would be a good thing if we add the class name to the error message)

Any ideas? I have tripple checked that all files and folders in Classes are 
written in Uppercase.

Thank you in advance!
Daniel