Pharmazentral Nummer - the PZN - is the number every medicine sold in Germany has, and its barcode is on the pack: a Code 39 of the PZN, with "PZN -" and the number under the bars.

What it holds
Characters	Digits only.
Length	A PZN has 8 digits, the last one the check digit. Type the first 7 - a shorter number is filled out with zeros in front - or all 8, and Labeljoy checks the last one.
Check digit	Always there, worked out by Labeljoy.
Readable text	"PZN -" and the 8 digits: PZN - 12345626.

An old 7-digit PZN becomes today's 8-digit one with a 0 in front: 1234562 is 01234562. The check digit stays the same. Type the 0 yourself: seven digits are read as a new PZN without its check digit, and Labeljoy adds one.

The rest of the settings - text position, quiet zone, color - are in the Barcode section.

What goes wrong
Numeric only data expected.	The value has something other than digits.
Invalid check digit.	The 8th digit isn't the check digit of the other 7.
This number can't be a PZN: its check digit would be 10.	No PZN has these 7 digits - check the number.
Input data too long.	More than 8 digits.