Document numbering and prefixes

Document numbering sets the prefixes and running sequences Fiddle uses to label purchase orders, sales orders, invoices, and other documents — for example PO-1001.

Set a numbering scheme

1. Go to Settings → Numbering.
2. Choose the document type to configure.
3. Set the prefix (such as PO- or SO-).
4. Set the next number and the padding (leading zeros) you want.
5. Save. The next document of that type uses the new format.

How numbers are assigned

Setting	Effect
Prefix	Text before the number, e.g. INV-
Next number	The value the next document will use
Padding	Minimum digits, e.g. 0001 vs 1

Numbers are assigned in sequence and are not reused, so each document ID stays unique.

Set numbering before you create many records. Lowering the next number below one already used can cause duplicate IDs, which is confusing for you and for customers and suppliers.

Keep prefixes short and distinct per document type so a number tells you at a glance what kind of document it is.

Next steps

Define how tax is calculated on your documents in tax settings.