3767537 - Error: "DocumentFailed--java.lang.Except ion: java.lang.Exception: Add On Request Validation Failed:Validation"

After performing the Synchronize SAP Information with Managed Gateway for Spend&Network task (program: ARBCIG_SYNC_SAP_ACIG_R; steps: SPRO > SAP Reference IMG > Integration with Other SAP Components > Managed Gateway for Spend&Network for Buyer > Global Settings > Send SAP Information to Managed Gateway for Spend&Network > Execute Synchronize SAP Information with Managed Gateway for Spend&Network), you face the following error in transaction SLG1:

DocumentFailed--java.lang.Except ion: java.lang.Exception: Add On Request Validation Failed:Validation failed for:

com.sun.org.apache.xerces.intern al.jaxp.validation.XMLSchema@XXX XXXXXerrors: [ org.xml.sax.SAXParseExcept

In the Managed Gateway for Spend&Network portal, if you filter by the Document Type Organization in the Transaction Tracker, you will see the following error message:

Organization request received from ERP has been failed.. Suggested Action : Please veirfy the Organization request received from ERP for any missing fields or paylaod is valid . ErrorCode:CIG-PLT-00625.

And, after downloading the error log (Validator):

Validation failed for: com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchema@XXXXXXXX
errors: [org.xml.sax.SAXParseException: cvc-datatype-valid.1.2.1: '<SystemID>' is not a valid value for 'NCName'., Line : 1, Column : 161
org.xml.sax.SAXParseException: cvc-attribute.3: The value '<SystemID>' of attribute 'SystemID' on element 'AddOn' is not valid with respect to its type, 'NCName'., Line : 1, Column : 161]

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SAP ERP Central Component all versions ; SAP Integration Suite, managed gateway for spend management and SAP Business Network all versions ; SAP S/4HANA Cloud Private Edition all versions ; SAP S/4HANA all versions

CIG, ISMG, SID, SystemID, Migrate transaction setups to Managed Gateway for Spend&Network. , KBA , BNS-ARI-CI-FND , Managed Gateway Foundation & Tools , BNS-ARI-CI-PLT , Managed Gateway - Platform , BNS-ARI-CI-PRT , Managed Gateway - Portal , Problem