AX 2012 - InventTable Set Field

I'm looking to default a field on the InventTable upon creation.

I've added a section in the InventTable.insert() method like the following:

//<mod>

            this.initCompanyFields();

            //</mod>

This method uses some logic and then sets this.field= a value.  

It is not getting populated.  I've debugged and the value is set on that field in the debug session, however it is not written to the database.

S