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python3odooV13
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@ api.onchange ( 'duration' ) 
def compute_status ( self ): 
    if self .duration! = 0 : 
        for record in self .subscription: 
            record.write ({ 'subscription_months_calc' : record.duration + record.subscription_months_calc}) 
            record. write ({ 'subscription_expiry_date' : record.subscription_registration_date + relativedelta ( 
                months = record.subscription_months_calc)})

I have wrote the above function to make change into my another custom module. It is not changing the value nor it is giving an error. Kindly help me.
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Cybrosys Techno Solutions Pvt.Ltd
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Hi,

Please try his code

from odoo.fields import Date
from dateutil.relativedelta import relativedelta

@api.onchange('duration')
def compute_status(self):
if self.duration: 
    for record in self.subscription:
        record.write({'subscription_months_calc': record.duration + record.subscription_months_calc})
       
        if record.subscription_registration_date:
            expiry_date = Date.from_string(record.subscription_registration_date) + relativedelta(
                months=record.subscription_months_calc)
            record.write({'subscription_expiry_date': Date.to_string(expiry_date)})

Hope it helps

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