Request Object FUnctions differently after applying Patch

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Hi,

We have applied till Patch 19 to our system. One major problem we noticed was change in the functionality of the REQUEST Object in BSP

Any form field in REQUEST Object used to be reset on its own , when a parameter was clicked on the search page:

Lets say the Request URL is

'http://server:port/sap/bsp/main.do?N1=ABCD'

BEFORE:

In DO_INITATTRIBUTES:

P1 = request->get_form_field( name = 'N1' ).

P1 = 'ABCD'.

Then lets say I click a radio button on Search Screen,

P1 = request->get_form_field( name = 'N1')

P1 = blank.

NOW:

In DO_INITATTRIBUTES:

P1 = request->get_form_field( name = 'N1')

P1 = 'ABCD'.

Then lets say I click a radio button on Search Screen,

P1 = request->get_form_field( name = 'N1')

P1 = 'ABCD'.

I want the parameter N1 to reset since my code is written that way but it seems now it is maintaining the old parameter..

Is this a bug or simply change of functionality by SAP.

Thanks