Hi, I have inherited the account.invoice.tax in the account modules and overridden the compute method adding to it some of my own calculations, bu the first thing i am doing is calling the super method. I have also inherited purchase.order and overridden action_invoice_create method from the purchase module, here as well i first call the parent method using super.

The original order of execution is action_invoice_create and then compute

but after inheritance the order of execution is action_invoice_create(original)-> compute(original)->compute(custom)->action_invoice_create(custom)

Why is that and not action_invoice_create(original)-> action_invoice_create(custom)->compute(original)->compute(custom) and how can i make it this way?

Here's the relevant code in pastebin as its too long to paste here http://pastebin.com/W0AtKk4n

Thanks