We are using the payroll app as it allows us to generate work entries for each employee. At the end of each month we send an export of this file to our external supplier that calculates the wages for us. 

The issue is that an employee can still request a holiday for the month that was already exported (e.g. because he forgot to register this upfront). This should impact his salary or at least his remaining amount of holidays left over. How can I prevent that updates to the work entries are being made after the 'closing' of this period, i.e. after downloading the file?