This Natural profile parameter allows you to specify the substitution character for the default code page. The substitution character is automatically inserted whenever the conversion of a Unicode character into the current default code page (see profile parameter CP) fails and the profile parameter CPCVERR is set to OFF.

Possible settings	n	Substitution character.
	OFF	If OFF is specified, the ICU default substitution character is used. Note: For further information, see also Profile Parameters in the Unicode and Code Page Support documentation.
Default setting	OFF
Dynamic specification	no
Specification within session	no