Each character in the string controls an address maintenance screen field group, corresponding to the position of the character and the field group number.

The following control characters are valid:

- (minus) = hide: The field and its keyword are hidden (and the screen is automatically compressed if there are no other visible fields in the line).

. (period) = optional field: the input field is processed as a normal optional field, the keyword is displayed two-dimensionally.

A field which is only maintained in the detail popup only appears on the main main maintenance screen if it is not empty.

+ (plus) = required entry field: the input field is handled as a required entry field, the keyword is displayed two-dimensionally.

* (asterisk) = display only: the input field is only displayed, the keyword is displayed two-dimensionally.

<space> = standard: the field is controlled by standard setting, seldom used attributes are, e.g. only maintained in an additional popup, and only appear on the main main maintenance screen if they are not empty.

Some fields, which are only relevant for certain applications, are hidden with this default setting, and must be explicitly displayed by the application program using '+', '.' or '*'.

# (hash) = always visible on the main maintenance screen.

This parameter makes a field which is only in the detail popup by default (on the main screen when it is not empty), always appear on the main maintenance screen, even if it is empty.