java.lang.NullPointerException when calling a stored procedure via Teiid

I try to create a function import for a stored procedure which I have in my sql database. When executing the stored procedure via mysql workbench, the stored procedure does fine.

I have described the issue in my first message in

https://developer.jboss.org/message/989044#989044

in detail. Attached you find the excerpt from the teiid error log and my vdb file. The relevant stored procedure is named srcProc and is also attached.