Need to convert Character to INT

I have 2 variables

var_1 type CHAR 100

var_2 type INT4 length 4

I have value '1234' in var_1. Now i want this to move to var_r.

I used MOVE statement, = , UNPACK but it works when itry from r/3 but this piesce of code is present in the RFC and is executed from portal. I am having problem for this conversion when i execute from portal.

Before raising i searched in foroum but not able to get the solutiobn

could someone help me on this?

Thanks,

Prashanth J R