FMRBT becomes a compatibility view in SAP S/4HANA.
Compatibility view — reads still work
Survives as a compatibility view rather than a real table. Existing reports keep running, which is exactly why this one gets missed; writes are not supported and the failure surfaces later.
Table
FMRBT
Module
FM
Fate in S/4HANA
Compatibility view — reads still work
SAP Note
2270445
Check this against the whole picture.
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Other tables that survive only as compatibility views