Removing a VTSS from VTCS_Config

Customer have a configuration where there are 2 VSM5 boxes and 2 VSM6 ones; Customer want to remove permanently their 2 VSM5 boxes; until now, they tried including a couple of dummy statements with the name of the OLD VSM5s which will be removed; the execution of the VTCS_Config is OK (RC=0), however when environment is up and running, several (not all) DFHSM-recover functions are abending with a message indicating MVC still related to the name of the old-VSM5s. We do not know te reason because of this; we mean, in the near past, we moved from VSM4 to VSM5