Thanks Lukasz,
I need to clarify my request a little more. I am from the relational database era where you can specify a unique key over several fields (attributes) that will be entered by the user. In the example below I do not what to allow the user to add a second record with project=5100, Year=2005.
Existing objects
Project Year MoreInfo
5100 2003 los lorum...
5200 2003 qwert...
5100 2004 qwert...
5200 2004 qwert...
5100 2005 qwert... My understanding of the Identifier datatype is an auto incremental number surrounded by hard coded text.
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