[FIX] hr_expense: expense of zero

- Create an expense of 0.00, validate
- The expense can never be set as paid since it's not possible to create
  a payment of 0.00.

An expense of 0.00 still makes sense in the following use case.

An expense is paid by salary before the expense is actually made, i.e.
I get 1000 EUR to redecorate my homeoffice, I get the money beginning of
the year. After that I want to book expenses against the initial payment
until the 1000 EUR is gone and I would like to make use of the expense
workflow to approve the costs.

opw-710695

0 files changed, 0 insertions, 0 deletions