Hello Fabio,

>>But if you leave off the table name (isblank(cField)), it works correctly.
>
>I test on VFP6 and give costant value.
>

This test is not valid, because the cursor is being populated with zero when you APPEND BLANK.

CREATE CURSOR PirillinoDelPicchio (a i)
APPEND BLANK
? isblank(a)   && shows FALSE
? a            && shows 0