Hello devel subscribers,
My problem is:
For example I want to update the actual_duraction(it is a number) in a task through webdav (hard coded!, without use of outlook or any other clients). Is it possible to update the current value(update mean: old_value+new_value) with 1 request(only PROPPATCH) (maybe something like this - concretely this doesnt work, should only give a clue what I want) [<ox:actual_duration>+1</ox:actual_duration>]), 
becasue now I have to fetch the tasks to get the old value then increase it with the new value and put it back to server=> so 2 requests(PROPFIND then PROPPATCH)
Thx for help


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