FRTB Accelerator Cube GuideImaNbExceptions
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You can control the multiplier $m_c$ in the formula for CA and CA-IMA by setting a custom value to number of exceptions to the ImaNbExceptions context value.
See Table 2 in the section III “Supervisory framework for the interpretation of backtesting results for the firm-wide risk model” for the numbers of exceptions and the corresponding multipliers.