CLEAR CREATE CURSOR BYBYBUG (AB V(200) NOT NULL) INSERT INTO BYBYBUG VALUES ('') * THESE TAGS MUST TO HAVE THE SAME STRUCTURE INDEX ON AB TAG T1 SET EXACT ON ? KEY(),KEYMATCH('') INDEX ON CAST('' AS V(200)) TAG T12 ? KEY(),KEYMATCH('') X1=[''] INDEX ON CAST(&X1 AS V(200)) TAG T13 ? KEY(),KEYMATCH('')>Anyway, where would you use such weird index key expressions in real life applications?