Merge command: [strnews-boxunid ]
Merge variable/item: strNewsLinkUNID

Comments:
This contains the unid of the document (database or category) that was used as `source` of the news box.

Formula:
@If(strSourcetype="category";strNewsLinkCategoryID;strSourcetype="database";strNewsLinkDatabaseID;@Text(@DocumentUniqueID));