What is the use of document ID field in ServiceNow

There are multiple ways to implement one-to-many relationship in ServiceNow
  1. Reference Fields
  2. GlideList
  3. Document ID fields
ServiceNow has provided "Document ID" field to hold a reference of any table because at some times we have a requirement to hold the reference irrespective of the table.

Document ID lets the user choose the table and the associated record



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