Can Not Set Check Number (tranid) using script

I have created custom record
I am entering data in this custom record. There is user event script written aftersubmit event.
After submitting custom record, i am creating Write check record through script, bt its not allowed me to set Check(tranid) field. Getting error - ReferenceError: "value" is not defined. (NLRecordScripting.fieldChange.f.tranid#3)

I think using script we can not set check (tranid) field...... Is it?
For information please refer my code also
function CreateWriteCheckEntry()
{
        //Begin: Getting details form custom record
        var headerAcc = nlapiGetFieldValue('custrecord_txn_entry_import_acc');
        var vendorId = nlapiGetFieldValue('custrecord_txn_entry_import_payee');
        var headerMemo = nlapiGetFieldValue('custrecord_txn_entry_import_memo');