Bill vs Real Work Allocation

Hi,

I try the following scenari :
- create a T&L project
- enter work on week 1
- create a bill on week 1
- generate the bill lines
- close the bill (change status)

Afterwards, I check if it is possible to change some real work on week 1
And this is possible.

Such behavior leads to a discrepancy between the bill and the real work.

-> do not allow to modify real work history when they are attached to the bill
-> add positive or negative line in the work table
-> alert the bill owner of the discrepancy