Application management : Configuration : Field Definer : Making field settings : Setting field attributes
Setting field attributes
For most business objects, you can set various field attributes for individual fields. You can for example, enable the Mandatory attribute to enforce the completion of a field. Some business objects, such as standard orders have field attributes that cannot be changed.
Usually field attributes can be enabled or disabled independently. For some fields, however, a particular attribute cannot be modified. For example, for some fields the Mandatory attribute cannot be disabled because Planon ProCenter requires the field to be completed. Some field attributes cannot be enabled in combination. For example, the Unique and Inherit attributes can never be selected simultaneously for a field. For information on all the field attributes, see Overview of field attributes.
Warning  
The field attributes Mandatory, In selection, Read-only and Default value can also be set in Layouts . Regarding the interaction between Field definer and Layouts , please note the following:
if the In Use option of a field was set to No in Field definer , this field will not be available on the Fields tab in Layouts .
In Layouts , you can see the field attributes as they have been specified in Field definer . If you have specified a field attribute in Field definer - for example you have set the Department field of the Personnel business object to Mandatory – this field has the same attribute in Layouts . You cannot change this field attribute in Layouts .
Tip  
For more information, refer to the Layouts user documentation.
 
Overview of field attributes
Linking a picklist to a free field
Using the 'Derived from field' and 'Derived field' attributes
Defining default values
Defining a default time
Using macros to specify a default value
 
 
Making field settings