When a repeating or optional section, or a repeating table, bound to the main data source, is immediately within a section ...

When a repeating or optional section, or a repeating table, bound to the main data source, is immediately within a section bound to secondary data source, then the end user will not be able to insert or delete the section (or the table row).

To allow insertion and deletion, insert first a fixed section bound to the main data source, and then insert the repeating or optional section or the repeating table.