Hi Ali,
Check if you have created TO with reference to multiple deliveries.
SAO help link : http://help.sap.com/saphelp_470/helpdata/en/52/f30c3c7ae9404ae10000000a114084/content.htm
For the second question:
https://help.sap.com/saphelp_45b/helpdata/en/c6/f83e744afa11d182b90000e829fbfe/content.htm
http://scn.sap.com/thread/1464228
Regards, Sai Krishna.
