All columns in the primary key must be included in the article.
For INSERT statements at a remote database to replicate correctly to the consolidated database, you can exclude from an article only columns that can be left out of a valid INSERT statement. These are:
Columns that allow NULL.
Columns that have defaults.
If you exclude any column that does not satisfy one of these requirements, INSERT statements carried out at a remote database will fail when replicated to the consolidated database.
Using BEFORE triggers as an alternative
An exception to this case is when the consolidated database is a SQL Anywhere database, and a BEFORE trigger has been written to maintain the columns that are not included in the INSERT statement.