UDF Creation

Dear Experts,

  I am new to PI and want to build one logic using UDF in sap PI 7.1.

  I have attached the payload, where input data is coming in multiple segments, so I need to capture the data For SUMME based condition on SUMID

  If SUMID == "011'

    then

     SUMME == " " (In the given payload valuse is "2612.00").

Please provide the UDF code for this requirement..