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

1. **Calculate Funds From Operations (FFO)**:
A common standard definition for FFO (often used in credit metrics) is: 
FFO = Profit Loss From Operating Activities + Depreciation, Amortisation, And Impairment Loss.
From the given facts:
- "Profit Loss From Operating Activities" (2022): 1,333,500,000 EUR
- "Depreciation Amortisation And Impairment Loss Reversal Of Impairment Loss Recognised In Profit Or Loss" (2022): 725,700,000 EUR
FFO = 1,333,500,000 + 725,700,000 = 2,059,200,000 EUR.

2. **Calculate Net Debt**:
Net Debt = Total Financial Debt - Cash and Cash Equivalents.
Total Financial Debt typically includes both short-term and long-term borrowings plus the current portion of long-term borrowings.
- "Longterm Borrowings" (2023-01-01): 8,416,700,000 EUR
- "Shortterm Borrowings" (2023-01-01): 444,100,000 EUR
- "Current Portion Of Longterm Borrowings" (2023-01-01): 1,909,300,000 EUR
Total Financial Debt = 8,416,700,000 + 444,100,000 + 1,909,300,000 = 10,770,100,000 EUR.

Cash and Cash Equivalents:
- "Cash And Cash Equivalents" (2023-01-01): 2,155,100,000 EUR.

Net Debt = 10,770,100,000 - 2,155,100,000 = 8,615,000,000 EUR.

3. **Calculate FFO / Net Debt Ratio**:
Ratio = FFO / Net Debt
Ratio = 2,059,200,000 / 8,615,000,000 = 0.239024...

Rounding to three decimal places, we get 0.239.

<answer>0.239</answer>