Here is new db.
I posted picture with opend form, query and report.
For any case:
FORM: frm_m_ispis_izvjesca_kupci_mjesecno
QUERY: query_m_izvjesce_mjesecno_sve
REPORT: report_m_kupci_mjesecno
To see results use date from: 01.08.2020 to 27.08.2020
Kupac: Buyer 2