A DocuNote database contains the number of system fields (like document title, creation date), which are built-in and take their values from database tables.
For example, the record Document_Title returns the title of the document from the table tblDocument in the database.
Furthermore, you are allowed to create your own custom fields that best fit your needs.
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System fields are predefined database records that contain specific pieces of information such as first name, last name, email address, company, mailing address, industry, occupation, etc.
System fields refer to the tables found in database and cannot be modified by end user. They just give the standard reference to all available values in the database.
The database system fields are structured hierarchically, including Document, Cases and Parent tables.
You must identify the table for the system to know where to retrieve the value from.
In other words, the field Project_Title will pull the value standing for title of the case and the field Parent_Project_Title will retrieve the title of overlying case.
Custom fields are the fields you can create in Fields tab in the Metaform designer.