Issue with UNB3_1 and UNB2_1

I am usingMicrosoft.BizTalk.Edi.BaseArtifacts.dll reference in an orchestration to set the EDI context properties. But UNB3_1 and UNB2_1 context properties are not available instead Unb31 and Unb21 are available. Where as in send port filters UNB3_1 and UNB2_1 are available, but no Unb31 and Unb21.. Are they both same?
[378 byte] By [GenuineBasil] at [2008-1-7]
# 1
Yes, they are the same.
Regards,
Leonid Ganeline
http://geekswithblogs.net/leonidganeline/
LeonidGaneline-MVP at 2007-10-2 > top of Msdn Tech,BizTalk Server,BizTalk EDI and AS2...