Hello Paul,
I do not understand why you want to change the Cheque number field to 'V' for all your visa payments, rather than just letting the number increment.
Many MYOB users make life hard for themselves, by changing the Cheque # field to EFT etc. This means that you have to change the entry in perhaps 99% of transactions that you do.
I always get my clients to ignore the fact that the field name says 'Cheque No" and instead consider that it is a transaction reference number, and just let the number increment as it wants to.
When there is an actual physical cheque to be entered then instead of the auto number manually enter CH12345 with 12345 as the actual cheque #. The prefix CH will stop the system from incrementing. In this way you only need to make a change for perhaps 1% of your transactions.
If you do want to have a note that it was EFT or BPay then add this to the memo line instead, but actually I would not worry.
The other great benefit in doing this is that each transaction has a different and unique reference #. Would you want all your invoices to not have a distinctive invoice # and for them all to have "INV" ?
I find it very frustrating when reviewing a client file and trying to find a single transaction when they all have a reference EFT (or BS - bank statement or PAY - payroll payments, or V - Visa or BP - Bpay) when there are a number with the same amount or memo etc. It makes it difficult to find the right transaction to review or edit without having to open them all. This is the real time looser! I usually manually change the first transaction to something like 10001, away from the current cheque series and let the system go from there. Try it - it will save you a lot of time & effort. Perhaps in a future release MYOB will change the designation of this field from'Cheque No' to something like 'Payment Ref' so that users do not feel the need to always change it, after all I agree that cheques are a dying means of paying others, and the banks are discouraging it. I hope that this helps.
Cheers
David