The required property, @openapi.openedge.entity.required, specifies the mandatory fields of an entity. It indicates whether a field can have a null value (unknown value in ABL or undefined in JSON).
In ABL, there is no temp-table support to specify whether or not a field is mandatory. So, the annotations for required fields are obtained from the database table definition when you generate a Business Entity class file from an express Data Object project or from a database table in the New Business Entity wizard.
DEFINE TEMP-TABLE ttBenefits BEFORE-TABLE bttBenefits
FIELD HealthCare AS CHARACTER LABEL "Health Care"
FIELD MedicalSpending AS INTEGER INITIAL "0" LABEL "Medical Spending"
FIELD StockPurchase AS INTEGER INITIAL "0" LABEL "Stock Purchase"
FIELD XTZDEPENDENTCARE AS INTEGER INITIAL "0" LABEL "Dependent Care"
INDEX EmpNo IS PRIMARY UNIQUE EmpNum DESCENDING
The required annotation is added at the entity level to avoid a large number of annotations being added to a temp-table. But, when generating the Data Service Catalog, the required property is added at the field level.
