Choose rows by TSTMP_START, not TSTMP_H

/* Need to select just last 12 months of data using the TSTMP_START field filter */
RSBKREQUEST.TSTMP_START >= [YESTERDAY - 1 YEAR]

Example starting value: 20240601000000

Preview via SE16

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Extract via SQVI

Apply the same filtering in SQVI, follow Extract SAP table via SQVI