; Exemple of countable lettering on Tiers' account ; with two transactions reflecting the reality (dates and evidence of money movements) 2014/01/01 Sell of a service ; Transaction of engagement (accounting evidence : invoice) Product:Sell:Service -700 Tiers:Client:Service:John_Doe 700 ; Letter-Tiers:2014/01/01 2014/01/14 Wire payment ; Transaction of payment (accounting evidence : bank statement) Tiers:Client:Service:John_Doe -700 ; Letter-Tiers:2014/01/01 Finance:Establishment:Bank:Current 700 ; WARNING: value of Letter-Tiers:2014/01/01 MUST be unique, ; usualy a strictly monotonic sequel: A..Z AA..ZZ AAA..ZZZ .. ; or any unique data mentioned in the evidence