How to convert a type object from unshared to shared.

Z:/test/dsfvob_204>cleartool mklabel dsf command.txt
cleartool: Error: Unable to perform operation "make label" in replica "dsfvob_204" of VOB "/dsfvob_204".
cleartool: Error: Master replica of label type "dsf" is "dsfvob_202".
cleartool: Error: Trouble applying label to "command.txt".
cleartool: Error: Unable to create label "dsf" on "command.txt" version "/main/cnbj_dsf_tools_001/1".

Z:/dsf/dsfvob_204>cleartool desc lbtype:dsf
label type "dsf"
created 2009-02-23T15:27:43+08 by xxx
master replica: dsfvob_202@/dsfvob_204
instance mastership: unshared
owner: xxx
group: xxxx

scope: this VOB (ordinary type)
constraint: one version per element

Z:/test/dsfvob_202>cleartool mklbtype -replace -shared -nc dsf
Replaced definition of label type "dsf".

Z:/test/dsfvob_202>multitool sync -export -fship dsfvob_204
Generating synchronization packet E:/multisite/ms_ship/outgoing/sync_dsfvob_202_2009-02-23T153321+08_6680
Shipping order "E:/multisite/ms_ship/outgoing/sh_o_sync_dsfvob_202_2009-02-23T153321+08_6680" generated.
Attempting to forward/deliver generated packets...
-- Forwarded/delivered packet E:/multisite/ms_ship/outgoing/sync_dsfvob_202_2009-02-23T153321+08_6680

Z:/test/dsfvob_204>cleartool desc lbtype:dsf
label type "dsf"
created 2009-02-23T15:27:43+08 by xxx
master replica: dsfvob_202@/dsfvob_204
instance mastership: shared
owner: xxx/xxxx

group: xxx/xxxx
scope: this VOB (ordinary type)
constraint: one version per element

Z:/test/dsfvob_204>cleartool mklabel -nc dsf command.txt
Created label "dsf" on "command.txt" version "/main/cnbj_dsf_tools_001/1".