Using the column Constraint

[Erike]

Im trying to ask the user to fill a text field if a set of given conditions.

I was nor working properly for me, so I reduced the complexity of the expression to a very simple one to isolate the issue.

I have defined it as follows:

IF(
ISBLANK([_THIS]),

false,
true)

When clicked on Save, the expected behaviour is:

if the field is empty the message must be displayed and not saved.
if not, the record must be saved

Well, it saves allways the record.

Seems that ISBLANK is providing an unexpected result. So, for a second column, I calculated it based on the value of the first column.

IF(
ISBLANK([recepcionNotaTransportes]),
true,
false)

What I see is that the second column provides a true or false value if the first column was empty or not.

But the first column was not displaying the error message if it was empty

What am I missing?