FIX: A foreign key constraint that you drop on a table at the publisher is not dropped on the table at the subscriber in a SQL Server 2005 merge replication
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise X64 Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise Edition
Notification Contents: New and All Modifications
FIX: A foreign key constraint that you drop on a table at the publisher is not dropped on the table at the subscriber in a SQL Server 2005 merge replication
http://support.microsoft.com/kb/938825/en-US