Add information about net annual rent (actual vs. target)

Problem description
Some key indicators for the transaction of investment properties are missing in SwissRETS.

Desired Solution
Add information about:

• net annual rent (actual): earnings from existing rental contracts by reporting date
• net annual rent (target): earnings from rental contracts when all units are rented out

[jensstalder]

@rgutzwiller

Are these equivalent to <rentalIncomeNet> and <rentalIncomeGross> (Current implementation within CASAONE) or do these represent something different? Like with and without additional costs?

If they are seperate something like this?

<prices>
    <buy>
       <price>123456</price>
       <currentAnnualRentalIncome>12345</currentAnnualRentalIncome>
       <targetAnnualRentalIncome>15345</targetAnnualRentalIncome> (or <potentialAnnualRentalIncome>?)
    </buy>
</prices>

Not sure if this the same / possible to handle the information with the existing fields.
Both are net amounts without additional costs.

German:

• Nettojahresmiete (Ist): Ertrag aus den per Stichtag bestehenden Mietverträgen ohne Einbezug der Nebenkosten.

• Nettojahresmiete (Soll): Bei Vollvermietung erzielbarer Ertrag ohne Nebenkosten.

• Stichtag: Datum

[jensstalder]

<characteristics>
    <rentalIncomeNet>12345</rentalIncomeNet> <!-- new (already implemented in CASAONE) -->
    <rentalIncomeGross>12345</rentalIncomeGross> <!-- future ? (already implemented in CASAONE) -->
    <rentalIncomeNetMaxPotential >14345</rentalIncomeNetMaxPotential> <!-- new-->
</characteristics>

@rgutzwiller Not implementing a "stichtag". Would that be problematic?