Thats amazing Hamid. but i do have more than one service on the sales order and more than one task so how would i do this based on product id to just update the one task.

Hey Steven,
the code will update all the tasks that are in any of the lines, not just 1 line and not just 1 task.
If you want to update all the tasks that are linked to that Sales Order and not just the lines you can do this:

for rec in records:
for task in rec.task_ids:
task.update({
'date_deadline': rec.commitment_date
})

Maybe I misunderstood what you mentioned. Maybe you can explain a little more, what is the expected behavior? And how you can distinguish for which task the deadline should get updated and for which not?

so i have confused the situation.

Each sales order has 3 tasks created from 3 lines/products
Project management
Commissioning
Manufacturing

Project management has a deadline that matches the sale order delivery date
the other 2 the date is set by the engineer

using your solution i understand that all three will update to the delivery date whereas i only need the project management task to reflect that date.

does that make sense ?

ok, now I got it. A quick but sensitive way is to match it with the product_id and I would definitely use the first code in the screenshot, not the second one in the comments, but adjust it as below:

imagine the id of the product is 10. (you should check it in the product variants, not products).

for rec in records:
for line in rec.order_line:
if line.product_id.detailed_type == "service" and line.task_id and line.product_id.id == 10:
line.task_id.update({
'date_deadline': rec.commitment_date
})

the right way to do it, can be adding a new boolean field on product like "Update Deadline" and then we check this field and update the task if the product has this checkbox as True.

Amazing, Thank you