Document '&1' contains too many lines

What causes this issue?

Document &V1& contains more line items than can be posted in FI. The
system cannot split the document into multiple documents.
The data comprises &V1& for all headers for the data that is to be
posted and for the line items
The following causes can mean that the system is unable to split large
documents:
The <AB>FI_GL_POSTING_SPLIT</> BAdI has not been activated, or its
method <AB>ACTIVATE_DOCUMENT_SPLIT</> returns the value FALSE.
The document contains tax data, or you selected the <LS>Calculate Tax</>
checkbox in the document header.
The document contains line items that are to be posted to an open item
account.
The document contains line items that are to be posted to a customer or
vendor account.

System Response

The system does not post the document, and does not create any ECS items
for it. This does not affect any other documents for the data that is to
be posted.

How to fix this error?

Split the document that is too large, and import it again into the SAP
system.

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.