Service Header in BTARN

Hi,

I am implementing 2A1 in BizTalk 2006 with BTARN 3.3. I am receving 2A1 from my partner and sending ack to my partner. The ack is sent successfully from our server but it failed while receving the same at our partner side.  I need a clarification in this. There is a value mismatch in the service header part of the message.

While receving, in service header, the instance identifier is having some value.

XML Path of Instance Identifier in Receiving Service Header

ServiceHeader/ProcessControl/TransactionControl/ActionControl/ActionIdentity/InstanceIdentifier

 

Whille sending, it is having a different value .

 

XML Path of Instance Identifier in Ack Service Header

ServiceHeader/ProcessControl/TransactionControl/SignalControl/inResponseTo/ActionIdentity/InstanceIdentifier

Can anyone help in this regard.

Thanks in advance