DONT ALLOW TO START POSTING IN CLOSED PERIOD

SYSTEM WILL ALLOW TO DO JE, ENTER INVOICE, ENTER CREDIT CARD CODING ALL THE WAY THRU THE END AND WHEN YOU TRY TO SAVE IT ONLY THAN DOES IT TELL YOU THAT PERIOD IS CLOSED. CAN IT BE FIXED SO WHEN YOU PUT A DATE IN THE CLOSED PERIOD IT WILL LET YOU KNOW PRIOR TO PROCEEDING WITH ENTERING FURTHER AND WASTING TIME.