First, I need to calculate **Funds From Operations (FFO)** for the period 2022-01-01 to 2023-01-01.  
A common proxy from the data given is:

**FFO = Profit Loss from Operating Activities + Depreciation, Amortisation and Impairment Losses – Gains on Disposal of Noncurrent Assets – Finance Costs – Income Tax Expense**

From the P&L items for 2022:

- Profit Loss from Operating Activities = 641,338,000 EUR  
- Depreciation, Amortisation and Impairment Loss = 479,186,000 EUR  
- Gains on Disposal of Noncurrent Assets (adjustments) = −25,357,000 EUR (this is a gain, so I subtract it)  
- Finance Costs = 61,367,000 EUR  
- Income Tax Expense = 152,369,000 EUR  

So:  
FFO = 641,338,000 + 479,186,000 − (−25,357,000) − 61,367,000 − 152,369,000  
FFO = 641,338,000 + 479,186,000 + 25,357,000 − 61,367,000 − 152,369,000  
FFO = 932,145,000 EUR  

Now, **Net Debt** at 2023-01-01:
Net Debt = Short-term Financial Liabilities + Long-term Financial Liabilities − Cash and Cash Equivalents − Current Financial Assets (excluding “Other Current Financial Assets”)

Short-term Financial Liabilities (2023) = 142,437,000  
Long-term Financial Liabilities (2023) = 6,402,913,000  
Cash and Cash Equivalents (2023) = 451,946,000  
Current Financial Assets excl. Other (2023) = 5,770,000  

Net Debt = 142,437,000 + 6,402,913,000 − 451,946,000 − 5,770,000  
Net Debt = 6,087,634,000 EUR  

**FFO / Net Debt ratio** = 932,145,000 / 6,087,634,000 ≈ 0.1531  

<answer>0.1531</answer>