Identifying the Enter pressed by the user in the Inputfield

Hi all,

We have one Comment field on Portal screen that is given by the user (User may press enter while giving the comments). We are sending that field value to R3 through RFC and when we are getting back that comment field value from R3 we need to identify the Enter pressed by the user. We are writing the code for identifying "/n" in that comments field but that is not working. Can anyone help me out in this? This is really urgent.

Thanxs in advance!!!