We upgraded to B2B 4.6 too. One thing you must do is to ask WM for the list of 4.6 fixes in advance and work out which ones you need. For our transition, we found out (mostly the hard way), that the following fixes were required in 4.6:
IS_4-6_FIX_19, IS_4-6_FIX_13, IS_4-6_FIX_9, TNS_4-6_FIX_10, TNS_4-6_FIX_7, TNS_4-6_FIX_4, IS_4-6_FIX_4, IS_4-6_FIX_3
You can see the list of applied 4.6 fixes in “Server > About” screen.
Also, if you are using the C1 Onramp Version 3, make sure you have Build #63. You can see the C1 Onramp Build ID by clicking on the “About” link in the Onramp window.
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