I have been able to resolve my OCI ORA-01017 error.
The problem was caused by my connection pools.
I had a connection amed "A" to access tables in a certain schema in my DB and another connection named "B" this time to access tables in another schema but in the same DB.
In Oracle BI Answers (presentation), I was trying to view data whitin the connection B but strangely OBIEE Answers was using the connection A.
In the end I removed/renamed the connection A and everthing worked like nothing never happend.
I am not saying that this is the best method. Maybe i skipped a config that assigns the default connection pool to use but it did the job.