Formatted search not working

Hi experts,

I am trying to use Free Text field in RDR1 as FMS and I am using this query:

SELECT $[SUBSTRING(T0.[Text], 1, 100)] FROM RDR1 T0

The formatted search is not working and I am not even able to access the field by Shift + F2.

Error is:

Internal error (-1003) occurred  [Message 131-183]

Please help.

Regards,

IC