Why do we lock objects in a transport ?

hi,
why do we lock objects in a transport in SE09 ? whats the benefit/impact ?
thks

Yes Thomas, today is my TRANSPORTS day
and btw, just to confirm about locking, I have a transport moved from old system to the new one which contains this object say a function group!!.
Now I modify this FG in the new system and include in a different transport.
Due to some reason (errors encountered during transport movement), it is decided that the old transport is going to be moved from old system to new system once again. Will this impact the object that I have modified and included in the new request in the new system ?? Is it bcos of this I am asked to lock and continue my work on that ??
hope i have not confused you

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    http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
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    SAP Global Support Center Austria
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    Moderator message - Please do not use code tags to format text - it should only be used for code
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