In backend, i can create a URLAlias with the checkbox "create in page root" unchecked. This is the only way to create a working url alias (see EZP-31110).

When using the API, there is no such option. The 4th parameter of neither createUrlAlias() nor createGlobalUrlAlias() does not have any effect.

Steps to reproduce:

1. Create a page named "start" and set content.tree_root.location_id to it's location id

2. Create another page "test" under "start"

3a. Add URL aliases to test

$repo->getURLAliasService()->createUrlAlias($location, '/test-redirect', 'ger-DE', true, false);

3b.

$repo->getURLAliasService()->createUrlAlias($location, '/test-redirect', 'ger-DE', true, true); 

4. See that the URL is global in both cases (/test-redirect instead of /start/test-redirect)

5. Open http://localhost/test-redirect and get a 404