How to find out if a transportation/accomodation request has been changed?

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Hello all,

I need to know if one transportation/accomodation request has been changed after being created. I am using the TRIP standard transaction to plan the travel request without any external agency integration.

My problem is that if I change any field of one travel request such as: begin time, city from, destination or whatever, I cannot

find any field or table that lets me know there has been a change.

I am using an user exit that triggers once you have pressed the "Save" button, but there is no info about the travel requests. There is info about the cluster of the trip, but not about the travel requests. Only the FTPT_REQUEST database gives me this information, but only the final one, so I cannot compare the previous values with the last ones.

Can you please help me with this topic? I don't know how to solve it.

Thank you very much in advance.

Best regards.