Because you have to according to the Value Added Tax Act (VATA) issue the invoice in 8 days following the delivery of goods. it is checked before refreshing the invoice issued whether it was issued withhin the legally prescribed period. If this is not so, you must have apparently entered incorrect delivery or invoice dates. You are warned about this with the following message: 

Close the window clicking .

Solution:

Otherwise thsi record is stored and can be displayed, but you must check and correct delivery date or invoice date accordingly!