Correct lead.doc.type and series for no. range no. &1 within &2 days

What causes this issue?

The combination of leading document type and series used in the digital
signature for your document is invalid for the relevant number range
number. This is because one or both of the following applies:
The same combination has already been used for digital signatures that
were created using a different number range number.
In Customizing, the combination is assigned to more than one number
range number in the same company code.
These requirements for the combination of leading document type and
series have been implemented in your system and take effect 30 days
after a document with a Portuguese digital signature has been posted.

System Response

Since the 30 days have not expired yet, the system allows you to post
the invoice.
After the 30 days have expired, the system will prevent the posting of
any invoices that use a number range number with an invalid combination
of leading document type and series.

How to fix this error?

Procedure for System Administrators

Enter a valid combination of leading document type and series for the
relevant number range number in Customizing for digital signatures
(Portugal).

Error message extract from SAP system. Copyright SAP SE.