For Fixed Income. Either Swap Spread or Spread to Benchmark depending upon the order type.
Spread to Benchmark: Basis points relative to a benchmark. To be expressed as count of basis points (vs. an absolute value). E.g. High Grade Corporate Bonds may express price as basis points relative to benchmark (the BenchmarkCurveName(221) field). Note: Basis points can be negative.
Swap Spread: Target spread for a swap.