TestLink

I am exporting Requirements to xml. Making some small changes in xml file (scope) and reimporting into Testlink.

This works fine in the demo version (1.9.9) (http://demo.testlink.org/latest/index.php) all fields are updated a often as i care to Import but in my installation I continually get the message

Skipped - Req. Spec. - Doc ID:1 - Already exists on other branch

can anybody tell me why?

1. demo version is NOT 1.9.9 anymore but 1.9.10
2. Without more information about your environment is near impossible. Best option => create a NEW FRESH installation and retest.
DOC ID HAS TO BE UNIQUE on a REQ SPEC TREE
What options has you choosen when importing ? other options ?
as you can understand the less info you provide the harder to try to help