Hi Ravi, thanks for your reply.
1) I'm just practicing and my procedure was created there on default.
2) Yes, you are right "user"."helloWorld.data::obdd" is a table
The code is from page 65 of http://help.sap.com/hana/SAP_HANA_SQL_Script_Reference_en.pdf
I will try your other suggestions tomorrow.
Thanks for your reply