as screenshot, why my father task (Create DS<Batch: file->file>) has 52hrs work when sum of 2 child task is just 12h?  
any idea are appreciated!
![enter image description here][1]
update: I'm using Microsoft project 2010   
solved: **So, check to make sure that none of your summary tasks have resources assigned**  


  [1]: https://i.sstatic.net/SqtGF.jpg