A field disappears suddenly and is no longer visible on the Form or List views.


Description

This article discusses how to validate a field's presence on the instance when the following behavior is encountered:

Cause

In this case, the most probable cause is the field has been intervened with at the Dictionary level.  It may have been set to inactive on the instance. 

Resolution

Navigate to the Dictionary record:

  1. System Definition > Dictionary
  2. Filter where table is name of the correct table in the hierarchy for which the field lives (ex: task)
  3. Filter for column name or column label to find the field in question.

You should be able to resolve the issue by locating and ensuring active = true, or verifying any other anomaly on the dictionary record.