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Filter feature layer list for tool input using validation

Question asked by clm42 on Feb 28, 2012
Latest reply on Feb 28, 2012 by clm42
Is there at a way I can thin out the layers that appear in one of my input fields using tool validation? I tried a solution using arcpy.mapping.ListLayers(arcpy.mapping.MapDocument('CURRENT'),'*address*') but was given an error that "Create object cannot open a map document." I want to show only the address point layer but will settle for showing all the point layers if that is what I have to do.