from the error system alias is missing /IWFND/maint_service >test the gateway client for odata service through /IWFND/MAINT_SERVICE or thru LPD_CUST, what is the system alias in ECC?. admin guide https://websmp108.sap-ag.de/~sapidb/011000358700000888382013Ehttps://help.sap.com/erp_hcm_ias_2013_02/
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