I would additionally textmerge your "thisform.text25.value" in the SQL-Select. When the SQL processes it is expecting queries based on a table.field basis. When you throw at it a thisform.text25.value it sometimes gets confused... You might want to change like

lcFormValue = trim( Thisform.text25.Value )

then in your WHERE,

WHERE ATC( "{{lcFormValue}}", SDISC ) > 0

(using curly brackets above for post... prevented from using angled brackets)