Purchase order generated by the production order

Hi There,

Suppose i have some purchase orders that are generated by a production order, normally the production team have the expected delivery date for those purchased items.

by convention, how to deal with this kind of requirement ?

Should we set the default purchase lead time for those items by the item “default order settings” ? or we assign the proper role to the production team user, and they can change the purchase order accordingly?

any suggestion will be appreciated.

many thanks.

any default setting is open to update, so set it and then let the production team user update to reflect when the service will be complete and how this impacts on the production plan.