Error when using the expression operator

Hi All
When i'm using the following expression in the expression editor i'm getting an error message "expression is not properly formed, error expression cannot be validated". But when i use the same expression in TOAD i'm getting the result. Can any one please help me where i'm going wrong?
SUBSTR (INGRP1.site_id_nbr, 1, 11)
|| DECODE (SUBSTR (INGRP1.site_id_nbr, -1, 1),
1, '1',
2, '1',
3, '3',
4, '3'
Thanks

This may be a bug in the expression validation, decode is valid in an expression operator always when Set Based code generation only is used (you may get errors if row based is used), if you configure the mapping to set based only code generation mode and default operating mode then try deploying the mapping you should be OK. Otherwise you build an expression that is valid SQL (set based) and PLSQL (row based), the CASE statement will give you this
Cheers
David

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