Zoho CRM - Function to Autofill a Field based on multiple data sources

We're using the Invoices module in Zoho CRM which we're storing two sets of data that we want to autofill on Invoice create/edit. Because there's two fields we can't use the Autonumber, but we're also trying to do something a little more advanced and I'm not sure if a function is capable of doing it or if we're back to the drawing board (very new to Zoho here)

The Invoice Number format that we use will ideally contain three parts;

1) A three digit code, in this case SIN

2) Data drawn from an existing field, the users Membership number, e.g 15388

3) The date of invoice creation, eg 160224

So all together the full string would be SIN15388160224

Is it possible to create a function that would recognise a blank field, and then collate all of this data and input it into this field?

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