SWPM Import Java system in MCOD

Hi,

My CRM7 System has Oracle MCOD database (two schema in one database) and 2 SID (Abap and Java). I create another system by restore my database (with my 2 schema) to another system. I restore also my FS Java (/usr/sap/sid Java/, /sapmnt/sid Java). Then I export my Java source system with SWPM. Now I perform the import in the target but do I delete first Java in the target with the same tools SWPM and then import my export Java source or it not necessary to delete but just import ?

Thanks a lot,

Philippe