Revisiting the new changes in the master branch with @tledesma we saw unexpected behaviors in the chargeback:

4. When you want to edit a copied rate, the measures selectors (Per Unit) don't appear because the "chargeback_rate_detail_measure_id" are empties. I realized that "metric" are empties too in the database.

@gtanzillo @jrafanie i think the first issue is result of removal of code that read yaml and initialized chargeback_rate_details for new records. Other 2 looks like minor changes/fixes result of changes that were made to remove AR Objects from session. I can take a look at 2 & 3.
Thanks @h-kataria! @lpichler can you please take a look at issue 1 since I won't be available next week? I removed the loading of the yaml file in this commit - https://github.com/ManageIQ/manageiq/pull/5828/commits/08fe0a24113648051d839cf931420479413f6bd2. Didn't seem necessary since that happens during seeding.
Reopenining, not all issues reported in this issue are fixed yet.
@lpichler @h-kataria I have also noticed that when you want to edit a copied rate, the measures selectors (Per Unit) don't appear because the "chargeback_rate_detail_measure_id" are empties. I realized that "metric" are empties too in the database.

@tledesma I can take a look on it also. Call it as point 4. thanks
@lpichler @h-kataria If we want to add a new tier, we cannot do it unless it is the first one.

Also, when I save a edited rate, the changes are not saved.
I don't know if it would be better to open other issue for them.
@tledesma yes I noticed it before a while also(5), it is for rates where we can select any unit (not for countable)
related to this thing is another bug.
that when editing exiting one, and I will change unit, then it is not stored. (6)
I don't what is better but issues are related, so we can keep it there and state them in first comment
and we can use checkboxes(task list) to see what is fixed.
@lpichler yes, you are right, so @amaurygonzalez can you please add them?
@amaurygonzalez can you open it please again ? It seems tthat it was automaticly closed after merge. Thanks!
@lpichler. I can't reopen it!. I think i don't have privilege for this
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@lpichler. I can't reopen it!. I think i don't have privilege for this