Working of SLIN in abap

Hi,

Can anyone please tell me how does the SLIN work in ABAP.

I am using a code which involves the use of SLIN in ecc 6.0 system. When I use the same code in 4.7 system, it is giving errors.

Can I copy-paste the code of the SLIN Type Pool from 6.0 system to 4.7 system ? What will be the effects of it ?