Specifies the repayment precedence of a debt instrument. creditSeniorityScheme 1-0 http://www.fpml.org/coding-scheme/credit-seniority http://www.fpml.org/coding-scheme/credit-seniority-1-0 http://www.fpml.org/coding-scheme/credit-seniority-1-0.xml Code 63 Source Description key Senior FpML Top precedence. SubTier1 FpML Subordinate Tier 1. SubUpperTier2 FpML Subordinate, Upper Tier 2. SubLowerTier2 FpML Subordinate, Lower Tier 2. SubTier3 FpML Subordinate, Tier 3.