All merge articles must contain a uniqueidentifier column with a unique index and the ROWGUIDCOL property. SQL Server adds ...

All merge articles must contain a uniqueidentifier column with a unique index and the ROWGUIDCOL property. SQL Server adds a uniqueidentifier column to published tables that do not have one when the first snapshot is generated. 

Adding a new column will:
     » Cause INSERT statements without column lists to fail
     » Increase the size of the table
     » Increase the time required to generate the first snapshot 

SQL Server will add a uniqueidentifier column with a unique index and the ROWGUIDCOL property to each of the following tables.