A new attribute type calculated using calcattr contains the result value in the base unit.
A specified calculation rule is only executed if the specified attribute type is given as an attribute to be calculated (calculated=TRUE) in the definition of a measure or dimension (attrname XML attribute).
If PROCESS is specified as the node type (nodetype), the specified attribute type is calculated only once and copied to the process instance.
If a calculation rule OT_FUNC is specified as the node type, the specified attribute type is calculated for every function in the process instance. It is also copied to every function.
Within a calculation rule (calculation), reference can be made to any existing attribute types. If this calculation is intended to access an attribute type for the function for which this calculation is currently being executed, this is used as the object name.