EventNetworkStatus missing

Hi,

During a NetworkConsult, I want to attach data for statistic reasons.
If I do that after the merge, I get an error message in my NTS log.
p:008f01fa1b2c20e8,00000000 @ c:008f01fa1b2c20e8,0193f7e0 r:2 c—t- n:91504105:TServer_Alcatel@Alcatel_DEV
* p:008f01fa1b2c20e9,00000000 @ c:008f01fa1b2c20e8,0193f7e0 r:2 c—t- n:91504104:TServer_Alcatel@Alcatel_DEV
@16:27:35.0150 [ISCC] Error: UserData update loop detected. Update rejected

And just after that :
@16:27:35.0150 [ISCC] Party object is removed: p:008f01fa1b2c20e9,00000000 n:91504104:

When the second agent answers the call, my first agent never receives the EventNetworkCallStatus.
I presume that it comes from of this update loop.
How can I do ?
Is there some parameters for ISCC for that ?

Thank you,

Stephane