How To Identify Current Posting Period [OMSY]

Period closing affects all logistic modules where valuated goods movements are going to take place.
Accounting valuation of material movements is effected on company code level, where the current posting
period is defined, and has to be updated at each beginning of a new period.

How To Open Posting Periodes [OB52]

The reason for opening posting periods each month is to impede illicit postings to prior periods (reversing).
Since there is no need for such a constraint in teaching, you are able to open posting periods a priori up to a certain date. SAP’s IDES department has already performed these actions for most company codes until 12/2008.