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 the child tables. Adding fields is a low-impact change, because the field can be hidden on tables that do not need it. However, if the field is being used across tables, deleting fields may cause unwanted data loss. Note: When adding choice list entries to a choice list on the Task table, make sure that 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.