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This error will only appear if you have a key field reconciles publication with APPEND ONLY. It means one of the following:
You don't have either an OMR Grid or a Barcode Reader Area with the key field reconciles checkbox turned on in your form (on all pages).
The field name of either the grid or the barcode reader area does not match the source data field name EXACTLY (it is case sensitive).
The data in the source data does not EXACTLY match the data being captured in either the OMR Grid or Barcode Reader Area.
The table you published from is not the one that contains the right data.
There are no columns in the source table for the reader areas to even match to.