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
MSTB
What it is
Stock currently in transit.
Module
MM
Fate in S/4HANA
Compatibility view — reads still work
SAP Note
2206980
Check this against the whole picture.
ERP Galaxy is a free iOS app holding 2,273 SAP tables, 248 published
S/4HANA verdicts, their key fields and how they join — entirely offline, with no account and
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Other MM tables that survive only as compatibility views