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The https://api.watsoncommerce.ibm.com/inventory/{tenantId}/v2/reservations endpoint supports multi-line reservations across same-cart or cross-cart scenarios. The calling application must validate each reservation line in the response:
For every line, confirm that totalReservedQuantity matches the requested quantity.
If totalReservedQuantity < quantity, the system has only secured a partial reservation. If your workflow does not allow partial captures, set acceptPartialReserve=false. In this mode, totalReservedQuantity is always zero on failure.
Because each line can return different outcomes, the API does not surface failures as HTTP-level errors.
Recommendation for your use case:
Always set acceptPartialReserve=false.
Treat any line where totalReservedQuantity == 0 as a hard failure. In this condition, no reservation was created for that item.
Marking not under consideration as this is not a defect nor enhancement request.