Frequently asked questions - Writer
Why are some records ignored?
To get copies of different labels, each label is inserted into a Next Record field. LibreOffice automatically does the same when inserting form field data from the data sources window.
LibreOffice automatically changes the record when moving to the next page. It is therefore not necessary to include the Next Record field in the last label on the page. For this last record, the change is implied and does not need a field.