TransferFields
If this option is enabled, field names in transfer fields formats beginning with a number retain the leading digits.
Leading Digits
If this option is disabled, leading digits are truncated from field names in transfer fields formats that begin with a number.
Note: This parameter solves problems arising during migration: The behavior of
marketing.manager 5.x corresponds to enabling Leading Digits. From
version 6.0 onwards, Leading Digits is disabled by default.