Analyzing Canceled Updates 
There can be many reasons why an update is canceled (Error status in the overview). The problem often exists for a very short time only; in this case, the update records can be processed manually. If the problem is of a more serious nature, you have to analyze it further.
Procedure
On the Update Requests screen, choose the update record you want to process. Either double-click on it, or choose the
Modules (Update Modules) button. This takes you to the overview screen of the update modules for this update request.Choose
Update records 
Debugging 
or the button 
(Debugging) to analyze a canceled update in the ABAP debugger.
You can also correct the errors in an update record using the ABAP debugging function. To activate or deactivate update debugging choose Settings Update Debugging On/Off . In both cases, the ABAP debugger stops at the start of the update module called up by the transaction.
Authorizations
To use the debugging function you require update authorization for authorization object system authorizations (S_ADMI_FCD), and ABAP authorization for debugging ABAP Workbench (S_DEVELOP).