Changes That Cause Existing View Descriptors to Fail

inserting or deleting segments in the middle of the hierarchy if you are updating the database

inserting or deleting a level in multiple occurring fields

changing the attributes of a field

deleting fields that are referenced in a view descriptor

inserting a field in the middle of a segment

adding fields to the end of database segments because longer segments might not be reflected in the RECORD statement's SEGLNG= argument