Hi Florian,
1. With double quotes also i am facing same issue as i explained in earlier reply.
2. Here in the procedure "Prices" is not any importing /exporting paramter FYI, and i believe "Prices" does'nt need any declaration as it is automatically get the structure of the data that we are going to assign. I am able to confirm this statement because after activating the class with the usage of MARA or COSP tables in procedure , at debug i can see variable "Prices" is hoilding data with the structure of corresponding assigned result from the select quey.
3. The related system NW version is 750, SP 0 and Kernel release is 745.
4. For ABAP Dev tools version, please have a look into the following snapshot.
Thanks,
Avinash