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The type linkage describes the assignment of a receiver function module and a receiver type to a particular combination of object type and event.

A type linkage must be created if the system is always to react to an event of a particular object type. The type linkages are evaluated at runtime by the event manager.

The event receiver should define a type linkage using a function module provided.

Type linkages are client-dependent and are written automatically into a Customizing transport request if the client is configured (in table T000 ) for changes to be recorded automatically. All entries are then transported including activation indicators.

In the case of client copy, you should ensure that the type linkages are copied into the target client, but are always deactivated in the target client. The activation indicator of each individual type linkage is only copied with client copy if explicitly requested (parameter option for copying tables of class A).

The event manager begins the evaluation of the active type linkages when it is notified of the ID of a created event. For event handling to take place, either the event created and its triggering object type or the event created and a supertype of the triggering object type must be entered for the type linkage.

An appropriate workflow is always started as a reaction to an event of a particular object type. Whenever workflow start is delayed or there is a sudden decrease in the number of workflows that are started, then the administrators may need to analyze the real cause behind such delays! Ususally such delays are caused when the event linkages are inactive and when errors are detected in the event linkages. Therefore it becomes essential to monitor the event linkages and keep a constant vigil on the number of inactive linkages and the number of linkages with errors. The Event linkages test helps you in this regard.

This test monitors the event linkges and helps you figure out how many linkages are available on the server and how many are currently active/inactive on the server. In addition, this test helps the administrators identify the number of event linkages with errors and figure out the real reason behind such errors.

Measurement	Description	Measurement Unit	Interpretation
totalLinkages	Indicates the number of type linkages defined on the server.	Number
activeLinkages	Indicates the type linkages that are currently activated on the server.	Number
totalInActiveLinkagaes	Indicates the number of type linkages that are currently inactive on the server.	Number	The event rerceivers will respond to events only when the type linkages are active. The detailed diagnosis of this measure if enabled, lists the linkage details such as the Client, Business object, event description, receiver type, receiver function modules, error linkage etc.
inActiveLinkagaesPct	Indicates the percentage of type linkages that were inactive.	Percent	A low value is desired for this measure.
totalErrorLinkages	Indicates the number of type linkages with errors.	Number	Receivers will immediately respond to events only if the event linkage is active is without any errors. Active linkages with errors result in the event being queued with error status and these linkages have to be reprocessed manually, if needed. Ideally, the value of this measure should be zero. If the value of this measure is abnormally high, then it indicates that there are too many errors in the linkages which eventually results in the delay in processing and lead to a delayed response to the events by the receivers. The detailed diagnosis of this measure if enabled, lists the corresponding type linkage details such as Client, Business object type, event description, receiver type, receiver function modules, error linkage etc.
errorLinkagesPct	Indicates the percentage of type linkages with errors.	Number	A high value for this measure is a cause of concern.