Issue with logic change

Hi experts,

I would like to change the follwing code :

loop at source_infocube into workarea_infocube where account =workarea_masterdata.-account

functionalarea IN r_functionalarea

profitcenter in r_profitcentre

************treatment******************************

endloop.

r_functionalarea and r_profitcentre are ranges

Into the following logic, because Ranges in BW transformations are not well managed:

loop at masterdata_table into workarea_masterdata where account = source-account.

if source- functionalarea >= workarea_masterdata -ff

and source- source- functionalarea <= workarea_masterdata -ft.

if source- profitcenter >= workarea_masterdata -pf

and source- profitcenter <= workarea_masterdata -pt.

************treatment******************

                        endif.

          endif.

endloop.

ff = range low functional area
ft = range high functional area
pf = range low frofit center
pt = range high profit center

Before starting the treatment I must be in the 2 ranges (Profit center and Functional area)

I must always find a value. I have 2 questions:

Are the 2 logics equivalent?If not, do I have to anticipate error cases in the second logic and how?

Thanks a lot.

Amine