A "course of dealing" is a sequence of conduct concerning previous transactions between the parties to a particular transaction that is fairly to be regarded as establishing a common basis of understanding for interpreting their expressions and other conduct.
Course of dealing - Wikipedia.
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commercial law [TRADE > trade policy]
usage
trade usage and course of dealing
εμπορική πρακτική
εμπορικό έθιμο
καθιερωμένος τρόπος εμπορικών συναλλαγών
iate