REST "Create Folder" Duplicate folder error despite non duplicate

Anonymous
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REST "Create Folder" Duplicate folder error despite non duplicate

According to API document, 
"Name has to be unique under the parent folder. " 
http://developers.marketo.com/documentation/asset-api/create-folder/
But This API returns duplicate error when the folder name has not be unique across all folders.
Is this a marketo defect?

For Example
MyFolder -+-Test1
               +-Test2
When I make Test2 under Test1    ==> Dupulicate Error
MyFolder -+-Test1-+-Test2
               +-Test2
Response is
{"requestId":"6b4e#14c8ccf57b7","success":false,"errors":[{"code":"709","message":"Test2 Duplicate folder name"}]}
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