https://userapps.support.sap.com/sap/support/knowledge/en/3744790
3744790 - Legal Unit is missing in table /SAPSLL/CORPAR when transferring billing documents to GTS...
When the billing document is transferred from S/4 HANA system to GTS E4H system, the legal unit is missing in field CUSVBS from the table /SAPSLL/CORPAR.