Error - Call of Oracle stored procedure using LC LSX

We are migrating from Notes 5 to 7. One of our Lotus Notes Applications uses LC LSX to call a stored procedure on Oracle Database. This works fine within Notes 5.

When calling exactly the same procedure from a Notes 7 client on the same PC the following error occurs :

“Metadata object does not exist, Connector ‘oracle’, Method -Call-”.

The connection to Oracle can be made but the call of the procedure (con.Call (Parms, 1, Result )) raises this error.

Executing e.g. “SELECT * From …” statements works fine.

Thank you for your help.

Stefan