Hello Mithali,
What is the reason, SAP says it is not valid in your case? Is it because of your ECC version being below ECC 6 EHP 4?
Anyways, you need to do some customization in the enhancement provided in this note. You can add the Transaction Counter field along with all other fields. Also you need to change the message type in PI system.
You need to copy the standard Message type and match it with new structure.
Regards,
Nitin