VSV FORM4 SUBMISSION – FIle Name Format for Proof withdrawal

My Form 4 is not accepting by new portal in the final stage of FORM4 submission . Shows reason " Invalid format of ARN" . I am able to enter payment details.(no option for challan attachment ). Asking for proof of withdrawal. Appeal pending with CIT(A). Even if attaching acknowledgement of submission on hearing and attaching that acknowledgement, showing error. Any specified format for APPEAL withdrawal proof on FORM4 .

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