Hello Rachid,
newer Netweaver releases allow both a RECEIVING and CHANGING parameters. You can also introduce a parameter object and pass it as an IMPORTING parameter.
In your case I would propose to pass a pointer to your table TYPE REF TO Table_Type so you can change the table entries in the method. You could return the changed table as a value parameter without impact if it was never changed later (check table sharing in
ABAP Keyword Documentation→ ABAP - Reference→ Processing Internal Data→ Internal Tables
As Matthew once said: There's the right way of doing things (my way) 
regards,
JNN