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As you know the object reference error can be difficult to track down.
The best advice is to turn on the diagnostic trace in configurationcenter and see what is happening at the point it fails.
I normal use the database access and calculation trace but you might want to put more tracing on.
Sometimes you will have more information on the error. see the follow for a example of this.
Also to trace done what is missing will also depend what you are trying to transport.
The list in the above article is a good example on the order to import.
Thanks for reply
Next week I'm starting big DT process, so will check how it works.
Logging turned on, on everything, with details level, gives me nothing, if error is on preprocesor(?) stage (when LD is reading file)...
In import log there is information: Object reference...
Have no idea why it is hard to add this missing object guid into log? If preprocesor(?) reads source xml, and is checking GUID by GUID if it exists in target system, why not to put into log failed guid?
Next step woluld be to find GUID in export XML "manually", check what it is, prepare additional export file...
Now I have to be a prophet to gues what is...