The OLTP database of the source system contains annual records. The balance carryforward is specified, as well as 16 period values, for debits, credits, and sales.

The extraction program, however, determines data records for each period and generates the accumulated balance including the balance carryforward per period. The balance carryforward no longer exists as a separate value in the BW System, however.

In addition, data records in which all key figures (debits, credits, sales, accumulated balance) would be equal to zero are not transferred to the BW System by the extraction program. These zero data records cannot then be displayed in a query.