In addition to entering a source rating code, you can optionally also enter a brief source description to elucidate the rating code. The purpose of this field is to provide more information about the chart rating than can be conveyed by the two-character source rating code.
Some examples of possible source descriptions are...
•AA - “Birth certificate” or “Quoted from hospital record”
•A – “The Times 3 Nov 1992” or “Mother’s memory”
•B – “from ‘A Good Life’ by C.Cook”
•C – “Rectified from 10am by John Smith”
•DD – “Alternative time 11:15pm” or “Several alternatives known”
•X – “Time unknown”
•XX – “Calendar type uncertain”