import list Unable to find a lookup list in publishing site

Hi,

I have team site , which has 2 custom list with master child relationship. I have exported list using
Export-SPWeb -Identity http://spserver -Path \\myip\\masterone.cmp   -ItemUrl "/Lists/masterone"

I have another publishing site and want to import these 2 custom list.
When i import master list its imported fine, when try to import child list getting following error
Import-SPWeb http://spserver1 -Path "C:\childone.cmp"

Warning: Unable to find a lookup list /Lists/childone. The list is not part of the exported package and does not exist in the destination site collection.

Pls tell how do i import child list.

thx

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iffi