Hi Ping Ge,
Firstly, check to see whether or not the P.O. and IBD have been transferred to GTS.
For that, go to the "Legal Control - Import" area, and in the "Monitoring" area, choose the "Display Existing Documents" report. Run the report for your feeder system documents, and check that they have both been transferred ok without errors.
If that is ok, then let us know, and we can advise other checks to be made.
Regards,
Dave