In belgian accounting, some tax lines in the tax report must be carried
over to the next period if they are negative.
If the balance for the next period is positive, it will be deduced by
the maximum possible amount that is carried over. If it is negative,
the negative balance will simply be added to the carried over balance.
This process repeats itself from one period to the other endlessly,
until the carried over balance come back to 0.
This is done by putting the carried over balance in dedicated analytic
accounts.
task id #2271978