Hi,

Try this way

Field :-

stage_weightage = fields.Float(‘Stage Weightage’)

Function:-

def save_contract_completion(self):
    total_weightage = 0
    for line in self.stage_details_ids:
        total_weightage += line.stage_weightage
    if total_weightage <= float(0):
        raise ValidationError(f'The total of stage weightage is %s' % (
            total_weightage) + '%. \nPlease, re-set the weightage of each stage.')
    elif total_weightage > float(100):
        raise ValidationError(
            f'The total of stage weightage is more than 100%.\nPlease, re-set the weightage of each stage.')
    elif total_weightage < float(100):
        return {'name': ("Confirmation"),
                'type': 'ir.actions.act_window',
                'res_model': 'contract.completion.validation.wizard', 'view_mode': 'form',
                'target': 'new',
                'context': {'default_contract_completion_id': self.id, }}
    else:        return {'type': 'ir.actions.act_window_close', }

Regards

The problem is that when you created the field you created an integer field instead of a float field.

You should delete that field and create a new one.