When you use the hours module it is important to create new salary periods.
This is done in the following way:
Go to the Salary periods screen:
Select the right period (monthly / 4-weekly).
Create a new line with ARROW-DOWN or the document button.
Fill in the fields and generate the periods and weeks through these 2 buttons (these can also be found in the action menu / lightning bolt):
Using these 2 buttons will fill the weeks/periods automatically
Check if the periods and weeks are correct and that there is no gap / overlap between this year and the previous year: