How to set up calculated fields AwareIM Documentation

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{{tag>Manuals How_To Aware_IM_Basics Attributes Calculated}}
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===== How to set up calculated fields =====

To get //**AwareIM**// to calculate the value of an attribute of a business object you have to define a business rule that will perform the required calculation. The rule should be attached to the business object that owns the calculated attribute. See the “[[docs:2500_config_apps:0800_add_edit_rules|Adding/Editing Business Rules]]” section.

In addition you can check the “Calculated” property of the attribute. This will make sure that the attribute is read-only on the forms of the business object. See the “[[docs:2500_config_apps:0700_add_edit_attributes|Adding/Editing Attributes]]” section.

For example, if you want to define an attribute called ''NumberOfLineItems'' in the ''PurchaseOrder'' object, you can define the business rule as follows:

<code aim>IF PurchaseOrder.MyLineItems WAS CHANGED THEN 
   PurchaseOrder.NumberOfLineItems = COUNT OrderLineItem WHERE OrderLineItem IN PurchaseOrder.MyLineItems </code>