You do not need to specify all data fields, unless each tag appears on a line by itself, followed on the next line by the field's actual contents. You may also want to specify all tags if the continuation lines in your records are flush left, in which case an undefined tag appearing immediately after a continuation line will be read in as text. It may be necessary to enter multiple variations of the source line. You will often find more than one variation of a source line for a given reference type in a database, in which case you will need to define a separate source line in your template for each such variant. The most complex source line should appear first, followed by source lines of decreasing complexity.
MARC formats are an exception.
Any colon, dash, space, or other character that appears along with a mnemonic or full-name tag is treated as part of the tag. When defining tags in a filter, these characters need to be included in the tag column of the filter for EndNote to find an exact match. The trailing vertical bars at the end of each line will be stripped out by EndNote. Do not include them in the filter. Type TI- in the tag cell, then press Tab to move to the Field column.