Hi
After doing changes in CDT for newly created requests it will work fine and process will fetch the updated details but for inflight ones it will be still old CDT is there any way to get the updated cdt to inflight instances
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You can try the "upgrade process" smart service found in Process Management Utilities - it's supposed to update a running process instance to the latest version, though I'd recommend you test it on a small number of instances (and preferably in a lower environment) to ensure it gracefully handles CDT versions first.
This is also a good reason to generally try to design process models that are short-lived - if don't have processes that are active for a long time, then you don't need to worry about updates.
Another important note is that this does not happen if you're using record data types - in that case the variable always uses the latest version of the record type.
Interesting - did not know that!