Subsequent Settlement: Retrospective Business Volume Update 
Use
If you have entered arrangements or conditions retrospectively (see
Subsequent Settlement: Retrospective Creation of Arrangements), you must retrospectively update the values for business volume achieved, so that the system takes all business volume into account during settlement accounting.Business volume can be updated subsequently with this function.
Prerequisites
All the relevant documents must be included in the document index (LIS information structure S111). You can check this as follows in the Data Browser (Tools ® ABAP Workbench, then Overview ® Data Browser):
Features
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S074Operative view (business volumes and income used for settlement accounting purposes)
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S015Standard information structure for analysis (standard analysis, planning, etc., if activated by you)
Activities
For information on how to carry out retrospective updating, please see
Subsequent Settlement: Carrying Out Retrospective Business Volume Update.Constraints
Because this function does not redetermine prices, does not carry out a new valuation, and does not make any changes to the document items, the following functional constraints exist:
The following examples illustrate the problems may liable to occur:

A rebate at corporate group level has been entered against condition type A001 (rebate arrangement 1), which is designed to take precedence over a condition requiring subsequent settlement belonging to condition type A002 (rebate arrangement 2) of the procuring regional purchasing organization. Since no adjustment of the document conditions takes place (in particular, no price determination) the exclusion cannot be taken into account.

The condition record A002 (rebate arrangement 2, regional incentive rebate) is included in the document conditions. A condition record belonging to condition type A001 (rebate arrangement 1, incentive rebate at corporate group level) is now subsequently determined. The business volume update for the condition record belonging to condition type A002 ought to be canceled due to the condition exclusion. It may also be necessary to reverse any posting to provisions for accrued income, re-valuate the purchasing document, and post appropriate follow-on documents. However, none of this occurs. The update remains effective despite the infringement of the condition exclusion.

The immediate vendor discount RL01 should only be valid if no subsequent rebate is granted. If such a rebate is determined retrospectively, the vendor discount ought to be canceled (new valuation, follow-on documents). The ensuing changes in the subtotals could have far-reaching effects. The vendor discount therefore remains unchanged.