Thank you Joyce Assaad-Veen for your reply,

The problem is the "confirm" button is related to a post function inside account Odoo module, So if I added button to start confirming Payment i should call "post" function.

Image : https://i.imgur.com/Onczffk.png

I tried to change "post" function to be able to confirm from a different status, I was able to do it, but the problem is the other classes, like "Account Invoice" they use the same function, in results I can't confirm the payment. also this function is used to calculate  other things.

Why, because I simply inheriting the same fields into two different Classes "Account Paymet" and "Invoice Payment".

I think if I am able to change work flow from confirming from draft status to another status. If you have any other idea you're more than welcome to share it.

Also I am not expert, So I use only my logic and my limited knowledge to fix this issue.

Hello,

If I understood your case well, that you need to add a state between draft and posted, I think you need to:

- create a new button that is shown on draft state so when you click this new button it will change the state to the specific state. So in python you add a method to do this change and you call this method on the button click.

- modify the invisible condition of the button that let it become posted, so you show it only in the specific state, not anymore on draft.

- you need to set which group can see each of the buttons, especially your new button, who is allowed to move it to the new specific state.