>Hey thanks for the response Bob. I have reviewed the help information. What I don't get is what is the meaning of "Empty"? I know what NULL is...
>
>A users interpretation of Empty is if they do not see any characters, then it's Empty. I tend to agree. It appears that the MM.NET framework BLG does not interprete it this way when building rules. I just hate to have to over-ride the generated code worrying that a rule for an Empty string will not indicate the string is Empty (no visible characters).

Johnny,

It has to do with how you make your selections in the BLG. When you select Required, and SetDefault, and AllowEmpty Value checkboxes. Required means it cannot be a null value. Allow empty value would mean an empty string is OK.

Check the dev guide topic Mere Mortals .NET Business Objects / Using the MM Business Layer Generator / Step 3 Select Database Items and look down near the bottom it explains this.
I hope that helps some.
Tim