Feature Request: End date shouldn't be mandatory for a loan + other parameters

[mikygee]

Feature Request

Version: 20.0.2

Hello,

I opened a loan, specified a start date and a duration but Dolibarr requires me to specify an end date.
This is not logical because start date + duration = end date in a simple case.

Also, this module count be improved because:

• I took a loan at DATE1 and during some time i didn't pay the capital, only interests
• At DATE2 I started to pay the capital and continued to pay for x months
• DATE2 + number of months = DATE3

In summary,

• End date shouldn't be mandatory because DATE2 + number of months = DATE3
• It would be nice if you added a DATE1 which would be the start date of the loan. And between DATE1 and DATE2, only interests are paid. Starting at DATE2, interests + capital are paid.

In reality it's a bit more complicated because between DATE1 and DATE2 you pay interests on what you borrowed. You don't borrow the whole capital at once but you might buy a house and ask the bank to pay then pay a building company that make some work in your house.
But let's keep it simple and let's assume everything is borrowed in one shot

• I borrow 165 000€ on october 1st of 2024
  ...
  I pay interests on these 165 000€
  ...
• I start to pay the capital on october 1st of 2025
  ...
  I pay interests + capital during 240 months
  ...
• Loan is finished

Use case

No response

Suggested implementation

No response

Suggested steps

No response