Hi again Paul,<br /><br />Thanks for answering my post.<br /><br />Your explanation sounds reasonable. I will try your suggestion. However in the documentation it states the following under "Assembling multiple documents":<br /><br /> <?xml version="1.0" encoding="UTF-8"?><br /><br /> <DDX xmlns="http://ns.adobe.com/DDX/1.0/"><br /><br /> <PDF result="GeneratedDocument.pdf"><br /><br /> <PDF source="cover"/><br /><br /> <PackageFiles><br /><br /> <PDF source="attachments"/><br /><br /> </PackageFiles><br /><br /> </PDF><br /><br /> </DDX><br /><br />The DDX document provides the following information about the documents to assemble:<br /><br /> * The <PDF source="cover"/> element defines the cover key word, which is associated with the PDF document to use as the cover page.<br /> * The <PDF source="attachments"/> element defines the attachments key word, which is associated with several PDF documents to assemble.<br /><br />The map value must use cover and attachments as keys. The values for the keys must be list data items that hold document values:<br /><br /> * Multiple PDF documents are associated with the attachments key word; therefore, the value for the attachments key needs to be a listdata item that holds the document values.<br /> * Data items in a map must be of the same type; therefore, although only one document is used as a cover page, the value for the cover key needs to be a list data item.<br /><br />Especially the last part made me believe that it was OK to use a list with only one element.<br /><br />Can you explain how I should understand the above?<br /><br />Thanks in advance<br /><br />Sincerely<br />Kim