4x to 7.1.1 B2B Product upgradation issue

Hi,
I am a Webmethods professional working in a product based company.We are planning to upgrade our development in 4x to 7.1.1,especially B2B part i.e. we have certain EDI transactions in ANSIx12.I heard that there is no upgradation tool available for the B2B upgradation.So, can anybody guide me to upgrade in B2B? :confused:
We are using Trading networks 7.1,IS 7.1.

Thanks in Advance…

Fany

i think you cannot directly migrate to 7.1 , you have to go through intermediate steps.
4.x–>6.1
6.1–>7.1

Thanks,
VJ

Hi VVK,
Thanks alot for the response.We thought of following the same as what u said but i am worrying about my services.If i do direct migration,i suspect the support for the servicefunctionality of the new version.Could you please let me know what are the things have been depricated in the new versions! and what are possible deviations may be encountered?

Thanks
Fany