3792327 - CDS changes after upgrade: P_BILLINGDOCUMENTBASIC replaced by I_BILLINGDOCUMENTBASIC (extension via e_*) and I_ARLOCKBOX no longer extensible - SAP S/4HANA

• During pre-upgrade analysis from 1709 to 2025, CDS view P_BILLINGDOCUMENTBASIC is no longer available and is replaced by I_BILLINGDOCUMENTBASIC.
• Extended fields previously added to P_BILLINGDOCUMENTBASIC cannot be accessed directly from I_BILLINGDOCUMENTBASIC because the EXTENSION association is not exposed in its field list.
• Access to custom fields requires manual associations or LEFT OUTER JOINs with E_BILLINGDOCUMENTBASIC.
• After upgrade, I_ARLOCKBOX has a GROUP BY clause and no extensibility annotation, making it non‑extensible.
• Existing extensions on I_ARLOCKBOX become invalid/redundant and custom fields cannot be accessed.

• Product: SAP S/4HANA
• Custom Fields
• Upgrade scenario: 1709 to 2025
• Deployment: on‑premise

cds view, i_billingdocumentbasic, p_billingdocumentbasic, e_billingdocumentbasic, extension association, extensibility, i_arlockbox, group by, @abapcatalog.viewenhancementcategory, s/4hana upgrade, cds extension, left outer join, non-extensible, custom cds view, ddls , KBA , BC-SRV-APS-EXT-FLD , Custom Fields , Problem