Updating in the Sales Information System 
Currencies
Currency amounts are always updated in the statistics currency. The statistics currency is assigned to the sales organization. Thus, SIS allows you to analyze and compare the data of several sales organizations that do not belong to the same company code and could therefore have differing local currencies.
You specify the statistics currency of a sales organization in Customizing for Sales and Distribution.
Quantities
Quantities are updated in the base unit of measure. The base unit of measure is the unit of measure in which the system manages the material stocks. It is specified in the material master record.
Weights and Volumes
Weights are updated in kg, volumes in dm3.
Cancellations
If a sales event is reversed (that is, canceled) the statistics are automatically adjusted to reflect this change.
Returns/credit memos
Returns and credit memos are updated in their own fields.