I've been using SetNewFieldValue to set fields on existing entities to null, per the docs. Today I went back to make a change to some code from last year, this was the first project I used LLBLGen Pro on, and found this:
if (this.FirstName.Text.Length > 0)
dalPerson.FirstName = this.FirstName.Text;
else
dalPerson.FirstName = null;
Interestingly, this code appears to work if I don't put a first name in the form. I see NULL in the database. This code uses self-servicing against SQL Server, and I just updated it to 1.0.2004.2 (Aug 5).
Did something change
Jim