Regardless of which character pair is included, 'CR' or 'DB', that character pair appears in the internal representation if the numeric value is less than zero. If the numeric value is greater than or equal to zero, the associated positions in the internal representation contain two spaces.
The credit and debit characters are always inserted with the same case used in the picture; for example, if lowercase 'db' is used in the picture, then lowercase letters are inserted into the pictured value, and if the combination of uppercase and lowercase characters, such as 'Db', is used, 'Db' is inserted into the pictured value. The 'CR' and 'DB' character pairs cannot be used in the same picture, and neither pair can be used in the same picture with any other character that specifies the sign of the value, namely, 'S', '+', '–' and the encoded-sign characters ('T', 'I', 'R').