How to check if only classification data is changed in MM02?

Hi Experts,

i have a requirement where in I have to send classification data to another SAP system.

This has to be done ONLY when classification data is changed in MM02.

I found a user exit where I can do my coding:

FM : EXIT_SAPLMGMU_001

Include : ZXMG0U02

However, this user exit is triggered for below 3 cases:

1. ONLY basic data is changed.

2. ONLY classification data is changed. < --- My condition.

3. Both basic and classification data is changed.

But my condition is applicable only for the 2. point above.

Therefore how to check if ONLY classification data was changed and nothing else? Please help!

Thanks

Gopal