can not delete old Configuration from replication

Hi

I am using SAP HANA 1.0.70 and SLT DMIS 2011_1_731

i wil setup a new replication and delete the old

1. Replication stop

2. Table entries deleted from DMC_STRUC_ID

3. the Schema-User deleted with cascade in SAP HANA Studio

4. run report DMCDTL_MT_CONVOBJECTS_RESET

5. delete the old configuration in TC: LTRC

Error message:     Error while deleting triggers

Can someone help me?

Thanks

Christof