October 09, 2015

Using MVG aggregate functions

Originally posted on blog.notesonsiebel.com on April 5th, 2007 by stuandgravy

Karan asked a question the other day: how to prevent the Status of a Service Request changing until all child Activities have been completed? This type of business rule is exactly what State Models are designed for: set up a model on Service Request Status and restrict transitions to the target status unless a condition has been satisfied. The difficulty in this example is how to write a rule based on child records?

State Model Rule Expressions use the same format as calculated field values, so the same MVG aggregate functions are available. The functions Count, Sum and EXISTS all derive a single value from a Multi Value Group and are an underused way to reduce scripting.

In the example given, Service Request has an MVG Action linked to the child Activities, so we can add a Multi Value Field to point to Action.Status.

A rule expression Not EXISTS([Action Status]<>'Done') in the State Model transition gives the desired restriction.

There’s a good example of the EXISTS function in use in the vanilla Siebel 7 repository: see BC Contact field Exists New OutBound Email Activities.

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