BW Security Vs R3 Security

Hi Friends,

I am new to BW Secuirty. I Have a fair idea of R3 security. Could some one give me an overview of what the difference between them both are?

Also in R3 transaction SU53 is used to see last transaction which was not run Successfully, This doesnt work in BW. Could someone tell which transaction will be used to do the same activity as SU53 in BW?

Useful answers will be rewarded.

Regards,

Praveen