Of the 585 German stocks in our database, 275 report semiannually. (You can tell with this command: InterimMonths(0) = 6.) All of those will have SalesPQ = NA.
The Polish stocks are primarily missing one period: the last quarter of 2022. FactSet is still investigating this. If you go back before 2021, all the quarters are in there. “Not available for historical analysis” is quite an exaggeration. See my comment here: Data quality/availability for european stocks - #9 by pitmaster