How to ... log KF Values direct input

Dears,

I have implemented the following SAP HOW To guides.

http://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10737ca2-cd3f-2d10-a58c-950c7743a1d6

It is perfect it is working fine but I would need to get the values of the KF the user sets.

I am able to get a -1 or 1 hwenever the KF is changed but not the real entered value.

So I tried to enter the enhancement in debug mode before saving to get the input data which will be used to save the log in the DSO but I cannot figure out how I can enter the "IF_RSPLS_LOGGING_ON_SAVE~LOG_WRITE" from RSRT Transaction.

I can enter the LOG_DEFINED without any issue but the function to save the data not.

Is there any body who experienced such a need and succeeded to implement it?

Thanks a lot

Cheers,

Cyril.