There is no mention of continuous monitoring in the MSA Statement, instead the company states that there is an onboarding process for suppliers which "requires the suppliers to pass a compliance check and accept E.ON’s Supplier Code of Conduct" (Page 3). Since it is an onboarding process, I expect this to be a one time acceptance and compliance check when the transaction between the company and the supplier begins.
I think this onboarding process is enough for an "in development" or "independent audit", unsure of which it would best fall under but I think they have enough to not be a "no"
"In 2021, E.ON continued to focus on monitoring existing and new suppliers to ensure thatthey complied with E.ON’s minimum requirements and that potential risks to health, safety,the environment and corporate social responsibility, including the protection of humanrights, were identified and mitigated. " Page 3.
"In 2021, E.ON continued to focus on monitoring existing and new suppliers to ensure that they complied with E.ON’s minimum requirements and that potential risks to health, safety, the environment and corporate social responsibility, including the protection of human rights, were identified and mitigated. This was facilitated by the adoption of a fully digital supplier onboarding solution at the end of 2018, which was integrated into E.ON’s enterprise resource planning (ERP) system. This means that every non-fuel supplier must complete this onboarding process if the individual transaction volume exceeds €25,000 (per event and per spend category) or the health, safety and environment risk is medium or high. This process (among other requirements) requires the suppliers to pass a compliance check and accept E.ON’s Supplier Code of Conduct. By the end of 2021, the suppliers involved in 99.5% of the non-fuel purchase orders and call-off contracts at E.ON companies that were part of the E.ON Group at the beginning of 2020 had completed the onboarding process." p. 3
There is an auditing process in place, though it seems like the company manage's it and the suppliers fill it out themselves so this would be 'self-reporting'.