The fields Telebox number or Data communication line no (ADDR1_DATA-EXTENSION1 / ADDR1_DATA-EXTENSION2 ) are no longer available after upgrading the SAP system in Customer/Vendor addresses. These fields could be maintained with values in a previous release.
From SAP basis Release:
SAPK-75004INSAPBASIS and all higher releases
KBA , BC-SRV-ADR , Address Management / Business Address Services , Problem
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