Service Development Help : Properties : OData Service Properties : Simple Property Properties : General Properties for Simple Property
General Properties for Simple Property
Property
Description
Name
Specifies the name of the Simple property. The name of the property must be unique within the set of Simple properties for the entity type or complex type.
Key
Indicates whether or not the OData element is a key. This property is available only for the Simple property of OData entity types.
Each OData entity type must have a Key property that uniquely identifies the entity type within the OData service at run time.
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True
Indicate that the property is a key. When selected, the icon representing the OData Simple property in the OData service editor changes to .
False
Indicate that the property is not a key property. This is the default.
Nullable
Indicates whether or not the property can have a null value.
Note:  
If you selected True for the Key property, the property cannot have a null value.
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True
Indicate that property can have a null value. This is the default.
False
Indicate that the property cannot have a null value.
Type
Specifies the OData-specific primitive data type of the property.
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