DSO keys and activation

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Hi guys,

I have two simple doubts.

1.Its regarding DSO keys.Suppose I have following structure in DSO.

Keyfields:

Char1

Char2

Char3

Datafields:

Char4

Char5

KF1

KF2

From answers to my previous post,I understood that we choose keyfields for two reasons in DSO.One is to determine overwrite functionality and also to determine 'unique records' setting.Now my doubt is:

since in the above mentioned example,we have characteristics both in Keyfields and Datafields area,do we still consider only characteristics in Keyfields area as KEYS for determining Overwrite functionality and Unique records settings or do we consider charcateristics in Datafields area also for this purpose?

2.I tried to activate data in DSO manually by clicking on 'Activate' button in Manage tab of DSO...Then I am getting message with red light saying --' Activation SID for DSO changes from xxxx to xxxx' ...what does this mean?

3.I observed that in all our live DSOs,the settings --'Activate data automatically' is choosen but still we use 'Activate data in DSO' variant in Process chain....whats the need for it when we are already choose the setting in DSO?

Thanks for your guidance.