Using SQL Function in SQL Requester

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Hi, I am creating a simple SQL Requester which will pull back data from 2 tables - PREQUIS and ACLOB.

I wish to use a SQL Function I have to convert the CLOB Text from RTF to 'readable' text.

This works fine in SQL, but when I try in the SQL Requester I simply get a blank field where the converted CLOB data should be.

Is there something specific I do I need to do please? 

Thank you.