[OpsMgr 2007R2] Where is my created group gone - Cannot retrieve my group to apply overrides

Issue :
Suppose a group is created in a non-sealed MP. A discovery is created in a other unsealed MP with the enable state by default to false. You want to override the discovery for the group created in the first non-sealed MP.
SCOM interface doesn't show you all the groups and you cannot retrieve your group !

The reason is an unsealed MP cannot be referenced by any other MP

3 ways to solve this issue :

1. Create the group in the same MP that contains the rule/monitor or discovery to override
2. Seal the MP that contains the rule/monitor or discovery - Overrides will be stored in the non-sealed MP that contains the group. Reference to the sealed MP will be created in the non-sealed MP.
3. Seal the MP that contains the group - Overrides will be stored in the non-sealed MP that contains the overrided rule/monitor or discovery. One limitation will be that the group will only accept new members only if it's a dynamic populated group.Reference to the sealed MP will be created in the non-sealed MP.

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