how to avoid the acquisitions and disposals effect

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Hi All,

I used a dummy entity to aggregates on "Total geography" hierarchy the historical data consolidated in a previous system. Now I need to stop the contribution of the dummy entity in a month (not January) without having movement effects like a deconsolidation, I need to have only the contribution until  the previous period (only opening in the current period). Do you know any standard method to do it?

Gianluca