why is this error occuring? I am trying to create a transfer record , it is not mentioned in record.type or scriptable but I am just doing creating a record and saving it.

ReferenceError: "document" is not defined. (NLRecordScripting.scriptInit$lib#326)

let createTransfer = record.create({
                type: 'transfer',
            });

            createTransfer.setValue('fromaccount', 218);
            createTransfer.setValue('toaccount', 219);
            createTransfer.setValue('trandate', new Date());
            createTransfer.setValue('fromamount', 1);
            createTransfer.setValue('toamount', 2);

            let transferId = createTransfer.save();

            log.debug('transferId', transferId);

Permissions ?

refernce error

UI most likely has admin access. Script uses a role you created, the role is missing some permissions.

message has been deleted

The issue is that you cannot create "transfer" records via script yet.

so we cannot do anything

Could you just use the URL and pass the record value by using record.fieldid in the parameters of the url. Although this won’t create and save the record it will open in create mode and pre-fill the values that you want?

I don't see "transfer" in the record.Type enumeration, and it's not in the list of supported suitescript types which suggests to me that what you are doing is not supported/allowed.