Document splitting cannot find a distribution for currency type &1

What causes this issue?

Document splitting has identified a situation that does not allow
documents to be split in a useful manner.
A line item has to be split in a currency for which no splitting vector
can be determined.

System Response

The document cannot be posted.

How to fix this error?

Ensure in your document splitting settings that this document is
classified with the correct business transaction. In most cases, the
document has been posted with an incorrect document type.
<DS:SIMG.SIMG_GLT0_T8G12>Classify Document Types for Document Splitting
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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.