This is an override for the domain-levelMultibyte Expansion Factor, described in Multibyte Expansion Factor, and is applicable to string entity attributes only.
It specifies an expansion factor (float from 1.0 to 4.0) to be applied when multi-byte character set (MBCS) data will be used with DB2 or DB2 for z/OS. It operates in conjunction with its equivalent domain option and the global build-time properties curam.db.multibyte.expansion.default.factor and curam.db.multibyte.expansion, which are described in the Cúram Server Developer's Guide. This option is only necessary for DB2 MBCS data in order to deviate from the global or domain settings. For example, you might choose to set this option to 1.0 (which effectively turns off expansion) for a string attribute where you know the contents will never contain localized data (e.g. they are constrained to programmatically defined Western characters and can't be input via a client). This option is ignored if the feature is turned off via the curam.db.multibyte.expansion property.