The Generic Table Extraction identifies the table header line with the help of the column labels. The engine maps the column headers that match with column labels and places matches in the data table under the column name defined in the column list. For multi-line headers, the engine uses only the line judged as the most appropriate for matching.
The search for column labels is a fuzzy search providing some results even for misspelled or poorly OCRed words. To ensure that the engine finds adequate matches, define all column headers that you expect in the documents as column labels of the corresponding column name.
For example, for the column name Quantity, define the column labels Qty, Quantity, and Quantity shipped.