A contractual clause barring claims after a specified period has substantive operation, extinguishing liability rather than merely barring a remedy. Where a contractual time bar operates analogously to a statute of limitations and there are multiple separate periodic breaches (not a running account), the rule for allocation of payments against statute-barred debts applies by analogy: returns are allocated first to current obligations, then to the earliest breaches within the limitation period, then to barred breaches. The rule in Clayton's Case does not apply where the accumulated deficiency arises from multiple separate breaches rather than mutual dealings producing a single running account balance.
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