lock conflict problems

Hello, I have IB Replicator 2.0 build 5.1 running one way 1-to-4 database replication, but replicating only 2 tables. The problem is: These 2 tables on the 4 target databases receive updates from other programs and constantly I get the error: ************************************** lock conflict on no wait transaction deadlock update conflicts with concurrent update *************************************** It started after the IBReplication began to work. Why do I get these erros? Does IBReplication require exclusive access on target tables? Thanks for any help! Julio