Copying Changes Using the Correction Workbench and BC Sets 
During a retrofit, objects with conflicts in the target system, or that were changed in the target system, have to be processed using postprocessing tools:
Correction Workbench (transaction SCWB): For changes to program, dictionary, and documentation objects (in transport requests of type “Workbench”)
Business Configuration Sets (BC Sets): For changes to Customizing content (in transport requests of type “Customizing”)
Features
Detailed change display in the merge editor, comprising the split-screen editor and the table changes display
Traffic light icons that indicate which objects are changed when the changes are copied, and whether the changes can be copied completely, partially, or not at all