If you getting issue about the 'Working Year' in invoice,

Firstly we need to check at General settings,

1- Go to Admin Section

2- Definition Section

3- General Settings

4- Program Settings 

5-  We can click to Do not check in the Working year field, 

Besides, we can check to  date control,  if we don't allow the  before active month, click ' Do Not Allow before active Month'

we can check to  date control,  if we don't allow the  before active date, click ' Do Not Allow before active date

we can check to  date control,  if we don't allow  before confirm date  click ' Do Not Allow before comfirm date'

or we can click to Do Not Control it.