Multi lines read in ALV using FM

Hi,

I have an ALV report, in that one fld is in edit mode the value can change for multi lines , when I click on a button the changed values need to store some where.

if it is '0' delete that record other wise refresh ALV. I have used FM in my report .can you help me?

and is it possible to do validations like retain the value if it is wrong entry.

Please help me