No document type was defined for transfer postings

What causes this issue?

In order to carry out clearing, transfer postings (for example between
business areas) may be necessary. However, the document type for the
transfer posting document has not been specified.

How to fix this error?

Enter the required document type for the UMBUCHNG clearing procedure.
To do this, you need to select the procedure. You reach the entry
screen via Goto -> Document type.
IF &DEVICE& = 'SCREEN'
<DS:TRAN.OBXH>Proceed</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.