[12.0][IMP] base_global_discount: add fixed discount selection

[primes2h]

It adds fixed discount as global discount type.

See https://github.com/OCA/server-backend/pull/267 for v. 14.0.

[ygol]

hello, Is it within this scope to add global discount amount either based on tax included/excluded base? Example with fix discount based on included TAX: 2046.45 before tax -900 discount 112.55 TAX 2159 Tax included -900 1259 after discount Thank you

[primes2h]

hello, Is it within this scope to add global discount amount either based on tax included/excluded base? Example with fix discount based on included TAX: 2046.45 before tax -900 discount 112.55 TAX 2159 Tax included -900 1259 after discount Thank you

Hello, fixed discounts don't work with subtotal when you have more than one invoice line. [*] When invoice lines are >= 2 you don't know how to proportionally distribute discount on the lines.

[*] with one line, fixed discount is covered by https://github.com/OCA/account-invoicing/tree/12.0/account_invoice_fixed_discount

[primes2h]

[*] with one line, fixed discount is covered by https://github.com/OCA/account-invoicing/tree/12.0/account_invoice_fixed_discount

I mean, with one or more lines.

[ygol]

[*] with one line, fixed discount is covered by https://github.com/OCA/account-invoicing/tree/12.0/account_invoice_fixed_discount

I mean, with one or more lines.

Thank you @primes2h

[primes2h]

[*] with one line, fixed discount is covered by https://github.com/OCA/account-invoicing/tree/12.0/account_invoice_fixed_discount

I mean, with one or more lines.

Thank you @primes2h

You're welcome! Feel free to do a review if you want. ;-)

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