The PDF preview does not work.
The HTTPURLLOC table needs to be maintained correctly for the PDF Preview to work correctly. See the following link for the HTTPURLLOC table:
Sometimes PDF preview issues occur if the URL cannot be resolved. The PDF Preview is using HTTP to download the PDF and display it in a HTML control. Check that these settings are correct, see note # 773830 for example.
Enable the SMICM HTTP Port and set the necessary parameters. Parameters for the ICM are described in: http://help.sap.com/saphelp_nw04s/helpdata/en/56/2e453cabf4ef6fe10000000a114084/frameset.htm