Hi Nabil
Try this code
if {RIN1.Loccode}= '1' then addrs := 'your address 1' else
if {RIN1.Loccode}= '2' then addrs := 'your address 2' else
if {RIN1.Loccode}= '3' then addrs := 'your address 3' else
if {RIN1.Loccode}= '4' then addrs := 'your address 4'
With Regards
Balaji Sampath