Unset Emulation flag on the BCV device

We got couple of BCV devices from our SA which has Emulation flag set and some with out.

SYMCLI doesn't support the establishing/split of the devcies together which has  the emulation and non-emulation devices.

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c:\Program Files\EMC\SYMCLI\bin>symmir -f pair.txt -sid 852 split

Execute 'Split' operation for the 3 specified device(s) in device file 'pair.txt' (y/ ) ? y

'Split' operation execution is in progress for the device list in device file 'pair.txt'. Please wait...

This operation cannot be completed because there are Emulation devices and non-E mulation devices

Example:

    BCV Pair Information

        {

        Standard (STD) Device Symmetrix Name   : 019A

        Standard (STD) Device Serial ID        : Not Visible

        Standard (STD) Device Group Name       : Not/Grouped

        Standard (STD) Composite Group Name    : Not/Grouped

        BCV Device Symmetrix Name              : 032C

        BCV Device Serial ID                   : Not Visible

        BCV Device Associated Group Name       : Not/Associated

        BCV Device Associated CG Name          : Not/Associated

        BCV Device Status                      : Ready           (RW)

        State of Pair ( STD <=\=> BCV )        : Split

        Time of Last BCV Action                : Mon Jun 03 7:13:01 2012

        State of BCV Mirrors                   : Synchronized

        BCV State Flags                        : (AllReady)(Emulation)

        Percent Split                          : 100%

        Number of Inv. Tracks for STD Device   : 0

        Number of Inv. Tracks for BCV Device   : 0

        }

Questions:

1) When do we use/need Emulation flag set on devices !

2) How to unset the emulation flag on the device

Appreciate your help.

Thanks in Advance