PREFLIGHT CHECK
Check that Mercari Shops inventory delta flags (1/2) and positive delta quantities are paired correctly.
🔒 Analysis runs in your browser; the file itself is not sent to BlueprintLab.
| Severity | Row | Column | Issue | Value |
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This unofficial checker covers only rules that can be verified in the browser. Live account settings, remote server state and later service-side validation remain authoritative.
Mercari Shops inventory updates require Product ID plus matching fields such as `SKU1_ID`, `SKU1_現在の在庫数`, `SKU1_増減フラグ`, and `SKU1_在庫増減数`. SKU2–SKU10 follow the same numbered relationship.
The checker pairs fields by SKU number rather than by their left-to-right position, so a missing intermediate column cannot silently connect the wrong SKU.
Delta flag `1` means plus and `2` means minus. The delta quantity itself is entered as a positive integer without a sign.
To subtract 3, use flag 2 with quantity 3.
The current-stock field reflects the exported point in time. Orders or individual edits while you work on the CSV can change live stock before upload.
This is especially important for decreases, because a valid-looking file can become impossible if live stock falls during editing.
ERROR covers missing Product/SKU IDs, incomplete field sets, invalid flags, or invalid positive quantities. Even with zero errors, the checker cannot remove the timing gap to live stock.
For a broader file check, also use the Mercari Shops bulk-update CSV checker.