EBU Single Rulebook Q&A 13 March 2023 2023_6747 PD calibration sample

Given the definition of PD calibration provided in EBA/GL/2017/16 section 2.4 paragraph 8, and the requirements for the calibration sample provided in section 5.3.5, paragraph 88 of the same guidelines, for developing a TTC model, clarification is needed on the expectation on the implementation of the back-testing performed in the validation phase.