user defined functions

hi all,

iam facing problem in rfc lookups when iam calling rfc function module(custom-built) in user defined function iam not getting the output. my function module has import 3 parameters & export 8 parameters . when iam giving 3 arguments as input to UDF iam not getting the output required its showing value as suppress in the target . iam doing file to proxy using bpm. my source file has header & item lines , i need to validate header first using function module parameters . i hav choosed UDF by calling rfc fun module . output of udf is giving suppress value its not giving the required output.