Plesk dont create folders when changing existing subdomain

[lhwparis]

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Plesk, 10.1.1, Ubuntu 10.04, x64

PROBLEM DESCRIPTION AND STEPS TO REPRODUCE
when i create a new subdomain with path /example Plesk creates folder /example thats ok. But when i change an existing subdomain to a not existing folder it says "folder dont exists" why is this handled different? why plesk doesnt create the folder when updating an existing subdomain?

ACTUAL RESULT
when i change an existing subdomain to a not existing folder Plesk says "folder dont exists"

EXPECTED RESULT
handle it the same way as new created subdomain and create the folder when it not exists.