Apex 4.1. cannot see the details of not null validations generated by apex

Hi there,
I have worked with APEX 3 quite a while. Now I move to new place, and they use APEX 4.
I am currently doing the Advanced Tutorials - Issues Tracker (written for 3.2 ) on an APEX 4.1.
I am quite impressed with a lot of enhanced features of APEX 4.
However, I think I got quite confused about the NOT NULL vaildations.
In the tutorials, they said when creating a form based on a tablle of which the columns have NOT NULL constraint, it will automatically generate NOT NULL validation.
But when I extend the validation section (in both Component View and Tree View), I cannot see any vaildation there.
So I go a head and create some NOT NULL validations for all NOT NULL fields.
Guess what, when I test the form, I got duplicate error messages.
I get these
6 errors have occurred
Project Name must have some value. (Go to error)
Start Date must have some value. (Go to error)
Target End Date must have some value. (Go to error)
Please provide project name. (Go to error)
Please provide project start date. (Go to error)
Please provide target end date. (Go to error)
My validation has error message "Please provide project name" while the automatic one has "Project Name must have some value".
The issue is I cannot find where the automatic validation is.
What if I want to customise the error message rather than just "#Label# must have some value".
Do any of you have any ideas why ?
I guess I must have chosen something wrong during page generation.
It could be quite simple but I don't know where to find the place that turn on/off the automatic not null validation, or at least customize these automatic error messages.
I currenly develop the application using workspace admin account.
Thanks a lot in advance.
Ann

I found it. Turn out to be the Settings, choose No for Required Value.

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