problem to invalidate the tanle

hi

i calling the RFC from the backend

and iam calling same RFC twice in two button

which will populate the data in the table

by fulfilling some conditions and data gets populated inthe

first table , as soon as i click on the second button

which calls the same RFC that i have used for the first button first table's data gets invalidated ,

so i have created a value data and used COPYService

to copy data for the first table , and problem solved

now the main problem is i want only one row to be

inserted inthe first table when i click the button ,

from the next time i click on the same first tables corresponding button it should invalidate the table and then

populated the new row . but iam able to see all

data or rows getting inserted int he table one after other

how can this be solved ?