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Use the "Create Unique ID" function of the DC Processing Extension to fill the dc_id field.
In addition, you should use the ArcView field calculator to prepend the numeric IDs with a prefix:
Example 3.3. Prefixing numeric Junction IDs with "JU"
Open the Junction table if it is not yet open.
Select → from the menu (if necessary).
Select the dc_id
field.
Select → from the menu.
Enter the following formula:
"JU"+[dc_id]
Select → from the menu.