Task table modifications Modifications made to the Task table are applied to all child tables. Be sure that the changes being made are appropriate for all of the child tables. Adding fields is a low-impact change, because the field can be hidden on tables that do not need it. However, deleting fields may cause unwanted data loss if the field is being used across tables. Note: When adding choice list entries to a choice list on the Task table, make sure the entry value is unique. You can use dictionary overrides to change some parts of a field definition in a way that does not to not apply to all child tables.