moving data from 1 internal tab to other using corresponding(including case statement to manipulate field) in abap 740

Hi,

i have moved records from 1 internal table to other using corresponding statement like

it = corresponding#(field1 = field1)

along with this i need to manipulate 1 field like

above is working fine

it = corresponding#(field1 = field1 case field2

when '1'

field3 = 'good'

else

field3 = bad)

but this i cant able to achieve

pls help