Business transaction cannot be processed by consolidation

What causes this issue?

You enter an intercompany business transaction and at the same time
post to an account which represents an affiliated company. Such
business transactions cannot be edited correctly by consolidation.

System Response

You receive a warning message during entry. You receive a corresponding
error message when trying to post the document.

How to fix this error?

You have to divide the transaction into two documents or use a document
type which allows a cross-company posting.

Error message extract from SAP system. Copyright SAP SE.