Hi,

In new api you need to define @api.depends instead of the store parameter. Please have a look on the method of account.invoice to calculate all amounts.

@api.one

@api.depends('invoice_line_ids.price_subtotal', 'tax_line_ids.amount', 'currency_id', 'company_id')

def _compute_amount(self):

    . . . .

This is in new api. Inside @api.depends you need to give the fields name. Odoo will manage calling of the method when value of the given field is changed. In given example invoice_line_ids is field of "account.invoice.line" and tax_line_ids is field of "account.invoice.tax" model.

In your case you need to define you function like...

@api.one

@api.depends(<field_of_model'account.dp.iva.tax'>.amount)

def _get_total_deposit_amount_(self)

    . . . .

I hope you will convert correctly.