c# - Docx4j.NET mail merge labels issue ('next record' ignored)

Question

I wanted to use docx4j.NET to automate the creation of address labels. A basic docx file with merge fields separated by the "next record" instruction, the latter seems to be ignored when merging.

I get pages filled with one address duplicated in each label cell (plus the "next record" token). e.g. for 10 addresses I do not get one page with ten addresses but I get 10 pages each having 10 labels filled with the same address.

Can anyone confirm or do I have to change either my code or the docx file?

Here the code I use:

 private static void mergeLabels() {
        java.util.List data = new java.util.ArrayList();
        java.util.Map map = new java.util.HashMap();
        map.put(new DataFieldName("First_Name"), "John");
        map.put(new DataFieldName("Last_Name"), "Doe");
        data.add(map);
        map = new java.util.HashMap();
        map.put(new DataFieldName("First_Name"), "Jane");
        map.put(new DataFieldName("Last_Name"), "Joe");
        data.add(map);
        string flInput = @"e:\docx4j\input.docx";
        string flOutput = @"e:\docx4j\output.docx";
        java.io.File inFile = new java.io.File(flInput);
        WordprocessingMLPackage template = WordprocessingMLPackage.load(inFile);
        MailMerger.setMERGEFIELDInOutput(OutputField.KEEP_MERGEFIELD);
        WordprocessingMLPackage merged = MailMerger.getConsolidatedResultCrude(template, data);
        java.io.File outFile = new java.io.File(flOutput);
        merged.save(outFile);
    }