E109: Company numbers, eXTra header, and certificate do not match.

What causes this issue?

The complete message is:
E109: Company number of sender owner from eXTra header and certificate
content do not match.
The company number used in the sent XML data does not match the company
number of your certificate.

System Response

The data could not be transferred.

How to fix this error?

Check to see whether you have assigned the same certificate (PSE file)
to different company numbers in the table T5D4X This is not permitted.
Clean up table T5D4X. Only certificate file BN<(><<)>X>.pse belongs to
company number <(><<)>X>.
The combination of multiple company numbers for one data provider takes
place in the Reporting Personnel Area (V_T596L). The subapplication for
this depends on the relevant data type.

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.