3557212 - Error occurs when previewing Customer Invoices in Financial Accounting (correspondence type SAP21)

The below error occurs when choosing "Preview" or "PDF Preview" customer invoices in Create Correspondence App with type SAP21 (FI Customer Invoices):

"You can only print documents posted from app Create Outgoing Invoices or app Upload Customer Open Items".

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

SAP S/4HANA Public Cloud Edition

Navigate to Create Correspondence App and input the following details:

1. Company Code 1010
2. Correspondence SAP21
3. Journal Entry 1900000001
4. Fiscal Year 2024

Select PDF Preview

With release 2408 it is possible to print and email FI customer invoices and credit memos in PDF form with the new correspondence type SAP21 (FI Customer Invoices) in the Create Correspondence App.
But only documents posted via "Create Outgoing Invoices" or "Upload Customer Open Items" apps can be printed. In the case example above the selected Journal Entry 19000000001 has document type KR and it is posted via Create Incoming Invoices App. Thus the error is valid.

Note that not all journal entries posted via the "Create Outgoing Invoices" or "Upload Customer Open Items" apps can be processed with SAP21.
SAP21 (FI Customer Invoices) currently supports only financial documents that are sales-related.
If a journal entry generated from either app is not sales-related, the SAP21 PDF preview cannot be produced.
Sales-related journal entries typically have journal entry type DR and posting key 01. In the "Manage Journal Entries" app, the customer line item of the journal entry can be viewed whether it is sales-related. 

To avoid error and to print customer invoices, use sales-related customer invoices which are posted via Create Outgoing Invoices App or Upload Customer Open Items App instead.

Printing of Customer Invoices in Financial Accounting (FI) | SAP Help Portal

Configuring the Output of FI Customer Invoices | SAP Help Portal

Create Correspondence, SAP21, Customer, Invoice, DR, Print, Output Management, Service ADS, F0744, F0 744, FB70, F4051, F4 051 , KBA , FI-AR-AR-CR-2CL , Correspondence (Public Cloud) , Problem