Need clarification about : Opening Balance Ownership Change

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Hi all

I need to understand this part of the documentation:

Page 395 states the following:

For entities where the consolidation percent has changed from the last period, FCCS_Mvmts_Acquisitions or FCCS_Mvmts_Disposals are calculated automatically for the Elimination member of the Consolidation dimension in accounts that are eliminated via plug accounts. Any accounts that are eliminated by customer specific rules (configurable consolidation rules or insertion point rules), the customer/partner must write the Opening Balance Ownership Change adjustment and they will populate FCCS_Mvmts_Disposals_Input/FCCS_Mvmts_Acquisitions_Input. Note that the seeded Movement members "FCCS_Mvmts_Acquisitions" and "FCCS_Mvmts_Disposals" are for system use only and any data entered to these members will be cleared. Members "FCCS_Mvmts_Acquisitions_Input" and "FCCS_Mvmts_Disposals_Input" can be used for data entry, Insertion Point Rules or Configurable Consolidation Rules.