To estimate the FFO / Net Debt ratio for 2022, we need to calculate the Funds From Operations (FFO) and the Net Debt for the year ending 2022 (2022-01-01 - 2023-01-01).

**1. Calculate Funds From Operations (FFO):**
FFO is typically defined as Profit Loss plus Depreciation, Amortisation, and Impairment. 
- Profit Loss (2022-01-01 - 2023-01-01): 305,300,000 EUR
- Adjustments For Depreciation And Amortisation Expense And Impairment Loss (2022-01-01 - 2023-01-01): 478,600,000 EUR
FFO = 305,300,000 + 478,600,000 = 783,900,000 EUR

**2. Calculate Net Debt:**
Net Debt is typically calculated as Total Financial Liabilities minus Cash and Cash Equivalents. 
- Noncurrent Financial Liabilities (2023-01-01): 5,689,900,000 EUR
- Current Financial Liabilities (2023-01-01): 650,100,000 EUR
- Cash And Cash Equivalents (2023-01-01): 1,942,400,000 EUR
Total Financial Liabilities = 5,689,900,000 + 650,100,000 = 6,340,000,000 EUR
Net Debt = 6,340,000,000 - 1,942,400,000 = 4,397,600,000 EUR

*(Note: Derivative financial liabilities are often excluded from standard financial debt in credit metrics, but even if included, they would change the ratio slightly. Standard practice uses interest-bearing borrowings.)*

**3. Calculate FFO / Net Debt Ratio:**
FFO / Net Debt = 783,900,000 / 4,397,600,000 ≈ 0.178268...

Rounded to three decimal places, the ratio is 0.178.

<answer>0.178</answer>