I am trying to change "svn:externals" property of a remote repository via this command:

svn ps svn:externals "vendor1 http://vendor_repo_here.com" http://main-repo-here.com

I am expecting above command to change the "svn:externals" property from whatever it is to "vendor1 http://vendor_repo_here.com".. But it throws an error:

Setting property on non-local target 'http://main-repo-here.com' needs a base revision.

So I try this:

svn ps -r HEAD svn:externals "vendor1 http://vendor_repo_here.com" http://main-repo-here.com

Now it says:

Cannot specify revision for versioned property 'svn:externals'

Am I doing something wrong? Is there anyway to change this remotely via command line?

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