Portal theme &1 does not fit output format

What causes this issue?

You used separate portal themes to generate PDF or print formats (PS or
PCL). The output format that you selected is not appropriate for the
portal theme currently set.

System Response

The broadcast setting is not consistent and you cannot save or execute
it.

How to fix this error?

Change the output format or the portal theme correspondingly. (The
portal theme is set to the first valid value for the current output
format when you display the corresponding tab page).

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.