Indian Railways — TDR rejection for cancelled train

We booked at ticket with details PNR-[protected]
Trn:12704
Dt:22-08-23
Frm BAM to HWH, but we get the message PLEASE NOTE:T.NO.12704 FROM SC TO HWH EXPR.LEAVING SECUNDERABAD ON 21.08.23 IS PARTIALLY CANCELLED BETWEEN BRAHMAPUR AND HOWRAH STATIONS. We filed TDR on 21.08.23 at 9 pm but got rejected with the message- Reason for Repudiation/rejection: Invalid TDR Timestmap : PARTIAL. Why did we get rejection? Refund the money as soon as possible.