Field Selection allows you to tune which fields from File A will be matched against which fields from File B. This allows irrelevant fields to be excluded, fields with different names to be compared, and even fields of different lengths and types.
When a new pair of files is defined for comparison, Comp_IT will automatically create field level comparison definitions wherever the Field Name, Type (numeric or alpha) and number of Decimal Positions are the same. These same rules apply if you choose to modify the Field Selection.
Any selection record comprises three parts, Field, Test and Value. It should be noted that individual selection records are linked by a logical AND.
During execution Selection operates as though a filter has been placed over the files and records that do not satisfy the selection criteria are ignored from processing and record counts.
If a value is specified it will be used to curtail the file comparison once this number of records has been processed. It should be noted that a matched pair of records count as one, as do unmatched records from either file.
If a value is specified it will be used to curtail the file comparison once this number of errors has been detected.