Join tables in QGis 2.01. Dufour

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I performed a "join" going to the properties option in a shapefile (in this case is just a table), in order to join the attributes from another shapefile that has a field in common, specifically "OBJECT_ID".

Some features appear with the right numbers and others with "Null".

However, in the shapefile I wish to join the information is correct and there is no "Null" in the trable.

Any idea why this happens?



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