The system reads the posted line items from the line item table (CE1xxxx, where xxxx = operating concern) according to the selection criteria you specified. In the following, these line items will be referred to as "original line items".

The system determines the new values on the basis of the valuation strategy that was defined for periodic actual valuation. The system creates a delta line item as follows for each original line item found:

• The system uses the same characteristic values as in the original line item (no derivation of characteristic values).

• Values and quantities that were transferred from the sales order or billing document in Sales and Distribution (SD) remain unchanged.

• Other value fields -- those which are filled using conditions from CO-PA or a material cost estimate -- are reset.

• This line item is then valuated using the current date.

• For each value field, the system calculates the difference between the new line item and the original line item, taking any other delta line items into account as well.

• If a difference exists for any value field, the delta line item is posted.

• The delta line item contains the document number of the original line item in the field Reference document number.

It is also possible to perform periodic valuation in a test run. This makes sense to do before you actually execute the valuation, since the log contains information about any errors which occurred plus the number of line items which were read and posted.

If the number of posted and incorrect records is less than the number of selected records, this is because the system only writes a new line item if at least one value changed.