how transfer Enter event in busines Partner scrren in nwbc

Hi experts.

In NWBC we have a BUSSINES PARTNER screen:(standard)

In this screen when you put a value on the Business Partner field and clicking ENTER

internally it is made a standard process that loads data in other fields:

MY PROBLEM IS:

I CREATED A NEW FIELD 'CUSTOMER ID' AND I NEED THAT WHEN YOU FILL data IN THE SAME and click enter  WILL DO THE SAME PROCESS THAT THE BUSSINES PARTNER FIELD MAKES   FILLING OTHER FIELDS.

The FEEDER CLASS IS : /BOFU/CL_FBI_GUIBB_LIST

THE HELPER CLASS IS : /SCMTMS/CL_UIH_CMN_BUPA.

I DEBUG  CLASSES AND I SAW THAT HE CARRIES THE FIELDS AFTER PASSING THE CODE BELOW:

read_data_helper(

       EXPORTING

         it_keys              = it_keys

         is_view_context_data = is_view_context_data

         io_service_info      = io_service_info

         is_ui_context_data   = is_ui_context_data

       IMPORTING

         et_ui_data           = lt_ui_data

         ev_preserve_sequence = lv_preserve_seq

         ev_data_unchanged    = lv_data_unchanged

in program /BOFU/CL_FBI_VWI_WITH_HELPER==CM002    .

But I could not understand how to pass the configuration of  standard bussiness partner  field  to  my new Z field.

Somebody can help me?

Thanks.

obs THE Bp FIELD IS WITH ACTION = STANDARD ACTION IN fpm.