Definition
Update rules specify how the data (key figures, time characteristics, characteristics) is updated to data targets from the communication structure of an InfoSource. You are therefore connecting an InfoSource with a data target.
Use
An update rule must be specified for each key figure and the corresponding characteristics of the InfoCube. For an ODS Object, it must be specified for the data and key fields, and for an InfoObject it must be specified for the attribute and key fields.
The following update types exist:
...
1. No update
2. Addition, minimum or maximum
3. Overwriting (with ODS objects and InfoObjects only)
A data target can be supplied with data from several InfoSources. A record of update rules must be maintained for each of these InfoSources, describing how the data is written from the communication structure belonging to the InfoSource into the data target.
The InfoObjects of the communication structure belonging to the InfoSource are described in the update as source InfoObjects (meaning source key figure or source characteristic). The InfoObjects for the InfoCube, on the other hand, are described as target InfoObjects (meaning target key figure or target characteristic). Similarly, the InfoObjects of an ODS object/InfoObject are called target InfoObjects (therefore, target data field or target key field).
Structure
There is an update rule for each key figure of the InfoSource. This comprises the rule for the key figure itself and the current rules for characteristics, time characteristics, and units assigned to it.
