Create a field NOT NULL in a z table

Hi,
I want to create a ztable and i need to create in it a field that can't be initial but it's not a field of the key.
Is there any kind of property to set a NOT NULL in the field??.
Thanx.
Jorge

"Initial Values" Column is an Indicator that NOT NULL is forced for that fieldCheck out the documentation below for you reference.
Use
    Select this flag if a field to be inserted in the database is to be
    filled with initial values. The initial value used depends on the data
    type of the field.
    Please note that fields in the database for which the this flag is not
    set can also be filled with initial values.
    When you create a table, all fields of the table can be defined as NOT
    NULL and filled with an initial value. The same applies when converting
    the table. Only when new fields are added or inserted, are these filled
    with initial values. An exception is key fields. These are always filled
    automatically with initial values.
    Restrictions and notes:
    o   The initial value cannot be set for fields of data types LCHR, LRAW,
        and RAW. If the field length is greater than 32, the initial flag
        cannot be set for fields of data type NUMC.
    o   If a new field is inserted in the table and the initial flag is set,
        the complete table is scanned on activation and an UPDATE is made to
        the new field. This can be very time-consuming.
    o   If the initial flag is set for an included structure, this means
        that the attributes from the structure are transferred. That is,
        exactly those fields which are marked as initial in the definition
        have this attribute in the table as well.

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