Postings in SAP are controlled by the 'opening' or 'closing' of posting periods.Normally, the current posting period is open for document posting and all otherperiods are closed. At the end of the period (month), this posting period is closed andthe new one is opened for postings. This way it provides better control.

It is, however, possible to keep all the periods or select periods open.

Transaction code for opening and closing periods in OB52

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