Hi,

First of all you have to correct the data type of the field amount_response, is it expected to hold integer or a string ? As per written function it has to be string, so field type should be Char or Text. Then modify the function as follows and see:

def _amount_response(self):
for rec in self:
amount_response = ''
if rec.currency_id:
amount_response = str(rec.currency_id.amount_to_text(rec.amount_total))
rec.amount_response = amount_response

Thanks

You are getting multiple currency in currency_id instead of one currency.