Belated Return U/s 139(4) to claim Refund as TCS colledted from LRS -- Education Loan

Dear Experts My client is having is Joint SB Account with her son. Son is studying in Australia. My Client has taken an education loan. The bank transferred the amount in this joint account & from there my client used to transfer the money to her son's account. Now the bank has deducted TCS of Rs.49600 and this is the amount of Refund. While filing the Return, at the stage of "Proceeding for Validation" the system is asking for the "Year of Collection" "asking to select from the drop down menu". I checked & rechecked the entire return many times, however I am unable to "Proceed for filing". Kindly help me inthis regard.