CL_BSP_WD_ERROR_PAGE_WRITER->WRITE_ERROR_PAGE changes in EHP1

Hi,

Please can anyone explain the following code that was introduced in SAP CRM 7.0 EHP1 in method CL_BSP_WD_ERROR_PAGE_WRITER->WRITE_ERROR_PAGE :

  if PRODUCTIVE_CLIENT_MODE ne ABAP_TRUE.
    data: LV_EXCEPTION typerefto CX_ROOT.
    LV_EXCEPTION = IV_EXCEPTION.
    while LV_EXCEPTION->PREVIOUS isbound.
      LV_EXCEPTION = LV_EXCEPTION->PREVIOUS.
    endwhile.
    raise exception type CX_BSP_WD_EXC_WRAPPER
      exporting
        PREVIOUS = LV_EXCEPTION
        TEXT     = LV_EXCEPTION->GET_TEXT( ).

  else.

We were on release 700 SAPKU70009 and implemented ehp1: 701 SAPKU70106 which contains the above code.

The result of the above is to display a BSP error in the interaction centre for non production systems and to display this as an exception in the message bar (same as before EHP1) in production systems.

Two Questions :-

1. Please explain why the above code was introduced to change display a BSP page error instead of an exception? 

2. And also why different behaviour for non-production systems?

Any help appreciated.  Thanks,

Samir