replication sql server FOREIGN KEY constraint error 3726

I created a merge replication between two databases in the same server

• merge publication : pub_1

• base1 : the source base

• base2 : the destination base (newly created with the replication)

All works perfectly

Now i want to remove some tables from publicated articles (in pub1) but the server, after doing a new snapshot and trying to resynchronise base2 it gives me this error message :

sql server replication not delete object 'dbo.client' because it is referenced by a FOREIGN KEY constraint. (Source: MSSQLServer, Error number: 3726)

what is the solution???

thank you