CXML and RosettaNet RNIF20

Hello,
Since I installed Ariba On Ramp 2.0, I get a “wm.ip.rn:receive java.lang.NullPointerException” when posting a RosettaNet message with RNIF2.
When desinstalling IS_6-1_Fix21 (required with On Ramp), RosettaNet works… but cXML flows don’t work anymore…
Did someone already get this same problem ?
Thanx
Thomas

Environment :
Version 6.1
Updates IS_6-1_Fix21
IS_6-1_Fix9
IS_6-1_FP2_Fix5
IS_6-1_FP2_Fix2
IS_6-1_FP2_Fix1
IS_6-1_FP2
RN_6-1_Fix8
TNS_6-1_Fix15