account root
Explanation: I found this term on a bilingual Band of Canada website:
Par actif personnel, Banque Nationale Courtage direct entend l’actif détenu sous une même racine de compte (6 premiers chiffres du numéro de compte) en date du dernier jour ouvrable du mois précédent.
http://www.bnc.ca/bnc/cda/newsdetail/0,2714,articleCode-1540...
By personal assets, NBDB means assets held under the same account root (first 6 digits of the account number) on the last business day of the previous month.
http://www.nbc.ca/bnc/cda/newsdetail/0,2714,articleCode-1540...
They kindly explain (in French and English) that the term relates to the first six digits of the account number.
-------------------------------------------------- Note added at 17 mins (2011-09-04 20:27:02 GMT) --------------------------------------------------
In the case of your source text, perhaps the account root relates to the first four characters of the account number.
| cc in nyc Local time: 17:22 Native speaker of: English PRO pts in category: 30
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