Upgrade from 46c to ECC

Hi,
Can you please explain me the complete procedure to be followed and precautions to be taken for upgrading SPAU(program,func groups,data elements,tables,structures, etc) objects, SPDD objects and custom objects(programs,func grps etc..) from 4.6c to ECC version.
Thanks,
Laks.

Hi ,
        The Precautions are .
1 .SPDD transaction should be executed 14 days before the upgrade .
2 .SPAU transcation should be executed after the Upgrade.
3 .Maximum error in SPAU can be resolved using Basis and Function Consultant support .
4 Maximum errors are in BDC,Sapscript ,Userexits which deal with standrad transaction .
5 .Also take care about The Unicode errors.
6 .For Unicode Use Transaction UCCHECK and SCOV.
Please reward if useful .

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