Export invoice xml

Hi all

I have a problem with the name of the electronic invoice export file, when I click the button the file name is automatically generated which includes the number of VAT numbers and 5 random numbers and letters such as: IT08138950962_0008B.xml

once the upper case alphabet is finished, the system automatically restarts the letters of the alphabet from a to z with the same numbers but with lower case letters such as: IT08138950962_0008b.xml

the problem is that the Italian tax system where to send the invoices does not distinguish between upper and lower case and indicates that it is tending to load the same number of files already loaded

is it possible to change this automatic random numbering?

thanks for help