Number of payers
All billing documents within the period to analyze (the decisive dateis the creation date VBRK-ERDAT) are taken into account to determinethe number of payers.

Underlying problems
If the number of payers used is small (e.g. 5) and if the volume ofdocuments is high (e.g. 10,000 orders), serialization effects may occuron the database part in table KNC1 (in this table, the sales volume isstored).

What to do
Is such serialization effects occur, the transfer SD --> FI can beseparated from billing document creation so that at least the invoiceprintout can take place at the same time as the transfer to FI. Notethat the total resource requirements will increase. See also SAP note23154 (OSS system).
Another option is to restart collective billing runs which deviate withregard to the payers. However, this requires modificationsspecified in the SAP notes 25147 and 25026 (OSS system).