Config Data Cache is used to store the list of line item fields that are used by various custom settings, like Config Display Columns, View Cart Custom Fields, and  Constraint Rule Criteria. These fields are used in line item queries constructed for CPQ's internal use. This optimizes the queries to fetch specific fields instead of fetching all the fields. The administrator must not update this custom setting manually.

SettingDescription
DataThe delimited data.
Is LastThe last value indicator