When a SQL script is run or validated in Reports Wand, the SQL execution will fail if the SQL is invalid.
Reports Wand will display the Oracle SQL error message in the dialog to help identify why the SQL has failed. These SQL error messages are the same messages that would be displayed in a SQL editor such as TOAD or SQL Developer.
For example, this script will fail when being executed or validated:
SELECT name FROM gl_ledger WHERE name = :NAME
This will fail as the table gl_ledger doesn't exist.