Try split -symforce -force... The "Symmetrix force flag" (-symforce) is different than the regular -force flag.
BCV staus is in SyncInProg. Its been there like two days. ANd i am trying to split or cancel relationship. I am getting below error  Split - Cannot proceed when the BCV state is 'Sync In Progress' except if the Symmetrix force flag is used Split -force - Cannot proceed when the BCV state is 'Sync In Progress' except if the Symmetrix force flag is used cancel - Cannot perform the operation because the device is not in a valid state (BCV device is in not ready state) cancel -force - Cannot perform the operation because the device is not in a valid state   Any suggestions will be helpful.
Unable to remove relation between STD and BCV