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I created project detail inside cost allocation detail, I added Amount field in cost allocation detail
How to get amount of the cost allocation detail inside project detail on change of field in project detail?
You can create a business process which automatically starts after the modification of Amount field in Cost allocation detail, reads data from the modified field in Cost allocation detail and modify data in the Amount field inside Project detail.
This is an example of how this business process may look http://prntscr.com/oaltf4