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I have a parent site, created a list and added few items to it. then I have created a site column type lookup referred to that list. then created a sub site, created a new list and added the site column to it. Now, when I create an item in the sub site list, the lookup works fine as expected, but when I click on the lookup item, I get a pop up message saying something went wrong. “List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user” I have observed that in URL appending subsite name. but it should not.

Expected result should be open the parent site list item.

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It can be done, but not using the UI.
Example copied from this answer:

#Get the webs and lists
$web1 = Get-SPWeb http://sitecollection/site1/
$web2 = Get-SPWeb http://sitecollection/site2/
$projectList = $web1.Lists.item("Projects")
$customerList = $web2.Lists.item("Customers")

#Add a lookup field
$projectList.fields.AddLookup("Customer", $customerList.id, "false")

#Get the created lookup field
$LookupField = $projectList.Fields["Customer"]

#Set the lookup web ID and lookup field
$LookupField.LookupWebId = $customerList.ParentWeb.ID
$LookupField.LookupField = $customerList.Fields["Title"].InternalName
$LookupField.Update();

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