Specifies the field that identifies the location of index data and provides default and literal (constant) index values. ACIF supports these types of fields for enhanced indexing:

Trigger field
This field is based on the location of a trigger string value.
Constant field
This field provides the actual index value that is stored in the database.
Transaction field
This field indexes input data that contains one or more columns of sorted data when it is not practical to store every value in the database. (ACIF extracts the beginning and ending sorted values in each group.)
Mask field
This field is based on a floating trigger and uses a mask to match data that is in the field columns.

You must define at least one field and you can define a maximum of 32 fields (FIELD1 through FIELD32). When you are adding a field parameter, use the next available number, beginning with 1.