[Gvsig_english] gvsig 1.1.2 symbols intervals

[Bettina Taylor]

Dear all,
I am having trouble to use the interval function in the layer properties. Although the layer has several attribute fields that could be used for this symbology, I can not choose them as classification field. When I open the "Layer properties", then go on symbols, then "intervals", the drop down menu of the classification field stays blank.
What can I do?
Thanks a lot
Bettina

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