php_value error_log realtive path in 5.2.8

Hi, please can someone try to add a logging with .htaccess and use a relative path to logfile? I always get an open_basedir error... open_basedir and document_root of domain points to: /path/path/ In /path/path/ is located the .htaccess with: php_flag log_errors on php_value error_log subpath/logfile.txt (logfile.txt is writeable) It just only works if path to logfile.txt is given absolut as /path/path/subpath/logfile.txt The relative path works reproducable in php 5.2.6 Please can somebody confirm this behavior? May be a kind of bug? This behavior seems to be new to me... Thanks, Andre