No PDF form defined for list &1 (reference order type &2, report &3)

What causes this issue?

You have not specified a PDF form in print control for list &V1& for
print variant &V4& with reference order category &V2& and print program
&V3&. You cannot print a list without a form.

System Response

If you are printing in online mode, the application prints the next
list, once you have confirmed the message.
When shop floor papers are being printed in the background, the message
is automatically confirmed by the system and the application then prints
the next list.
However, if printing is carried out during updating in an update work
process, the system terminates the update and the order or changes are
not saved. Printing in an update process is often carried out during
batch conversion of planned orders. If an error occurs, the system
terminates not only the current conversion but also any mass conversion
that may be active.
If you execute <LS>Printing of Shop Floor Papers</> in the background in
mass processing, the system terminates background printing after it has
output the message. You can use transaction <DS:TRAN.SM58>SM58</>
(transactional RFC) to determine the cause of the error.

How to fix this error?

In print control, enter a PDF form for the list &V1&.
<DS:SIMG.SIMG_CFMENUOLPFOPK8>Execute Function</>

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.