Is it possible to close the financial period (annual) then restart the reference numbers, as if when an invoice has been entered, automatic reference will start from No.1 instead of going back to previous year invoice last reference. You can enter the reference manually but I’m trying to find a way to make the automatic tick start from 1 in the new year or closed period.
No. Manager is a perpetual accounting system. Financial period closures are not performed. See Close an accounting period | Manager.
An alternative is to prefix the year to your reference number format, allowing enough decimal places to accommodate any conceivable number of transactions. For example, the first transaction of every type this year would be manually given a reference number like 240001. Form defaults would be set to automatic reference numbers. So the next would be 240002, 240003, ….
Next January, you would set the first transaction to 250001, and so forth. I have used this approach for years. Of course, you adjust the number of significant figures to match your projected business. If you have a low volume, you might get away with 2401. Or you might need 240000001. The good news is that you can always increase the number of digits if your business grows in later years. But you can never reduce.