What is System Change Option Used For?

Hi,
I need help on security.
we use scc4 settings for client protection. the settings are 'No changes allowed' for client-specific objects and 'No Changes to Repository and cross-client customizing objects' for cross-client object changes.
system change options are set to 'Modifiable'. what is the difference between these settings? Is there any situation that may cause problems?
thanks,
- ferudun

Hi ,
      No Changes allowed flag is explained as below
This flag means that changes in the customizing settings of the client
are not permitted (client lock).
However, customizing settings can be exported from the client by manual
creation of a transport request. A manual transport can be carried out
in the particular transaction for settings with the function Transport,
which places the selected customizing settings in a transport request.
In a productive client, the customizing settings that can be maintained
as "current settings" are excluded from the client lock; this means that
current settings (e.g. exchange rates, posting periods) can always be
maintained in the productive client
For 'No changes to Repository and cross cleint customizing objects' explained below
   o   Changes to the Repository and cross-client Customizing permitted
       There are no restrictions on the maintenance of cross-client object
       for the client when this setting is used. Both cross-client
       Customizing objects and objects of the SAP Repository can be
       maintained.
   o   No change to cross-client Customizing objects
       Cross-client Customizing objects cannot be maintained in the client
       with this setting.
   o   No change to Repository objects
       With this setting, objects of the SAP Repository cannot be
       maintained in the client.
   o   No change to Repository and cross-client Customizing objects
         Combination of both restrictions: Neither cross-client Customizing
objects nor objects of the SAP Repository can be maintained in the
client.
Please reward if useful.

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Hi All,
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By understanding the architecture of SAP like, what is a Client , Cross-Client settings and Repositories. You might have an answer, why this system change option is really needed.
refer the link:
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Description
Use this program to set the system change option.
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Requirements
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