How to copy record from one subtype to another subtype within a same infotype in ESS portal?

Hi,

I have to implement a method which will solve my problem. For example user create or edit exist record of address (IT 0006, subtype 1) and I would like that these changes also appeared in the same infotype 0006, but in another subtype - example subtype 2. What is more these changes will be taking place through the portal ESS.

I know that I have to use Badi HRPAD00INTYBL and method  if_ex_hrpad00inftybl~modify_computations, but I still have problem. Example class CL_EXM_IM_HRPAD00INFTYBL shows how to copy record from IT 0002 to custom infotype, but I need do this copy within the same infotype.

Thanks in advance for any ideas.

Best regards