Hello, I need a bit of help in a small problem.

On my form I have a one2many editable field which must if required create another line with calculated values, like in v7.0 when introducing journal entries lines. The problem is that I am using V6.1 and I need a similar functionality. I thought maybe the context would solve the problem by setting the current line values at the context and reading them later, yet that doesn't work, for each line context open as empty. Anyone has a solution or ideia how to solve this issue?