Profit center is not being derived from 1st line item in SAP S4 Public Cloud

[SAPSupport]

While posting the entries, if the user is entering the profit center in 1st line item, then the system should derive the profit center in 2nd line item automatically, because document splitting is active here.

But the system is not deriving the profit center in 2nd line item automatically.

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[SAPSupport · Accepted solution]

Document splitting does not derive the account assignments on the entry view of the document, the exception to this is so called follow-up costs as realized exchange rate differences, cash discount lines and penalties which are split already in the entry view (not only in the entry view).

See help.sap.com documentation Document Splitting Process
https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/7575d8ce581046a0a058a6ab...

Here you see in the examples shown that the document splitting process derives the account assignment on the ledger view

See also Examples of Business Transactions Used in Document Splitting
https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/dee14b1a6c264e46b78d22d9...

Unspecified Posting (Business Transaction 0000)
When you make unspecified postings in document splitting, business transaction 0000 is used.

https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/7ff994cc93c34eabadc118e5...
The following example represents a transfer posting between two profit and loss accounts. Both items are completely assigned to different profit centers, which means that no document splitting takes place. However, to ensure a zero-balance on the assigned profit centers, additional zero-balance clearing line items are created.

I reference you also for your information 

1628607 Document splitting: Business process assigned in entry view
As referenced therein 
In document splitting, you expect that certain business processes already contain all necessary account assignments and are no longer split because an account assignment according to cause is not recognizable from the document to be posted. This SAP Note describes how to handle these processes in configuration.

I reference you also for your information 
2801589 - Document type to derive account assignment into Balance sheet from P&L Account