Creating a ValueTable with a column that has dependency

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I am creating a python tool which looks like the figure below.



Input feature: It asks for a input feature class. Valuetable(Lookup tables): It has two columns - one for look up tables and another for fields.

The fields in value table should have dependency on Input feature. is this possible ? How ?

Code:

def getParameterInfo(self): param1 = arcpy.Parameter( displayName = "Input Feature", name = "in_features", datatype = "DEFeatureClass", parameterType = "Required", direction= "Input") param1.filter.list = ["Polyline"] param2 = arcpy.Parameter( displayName='Lookup tables', name='lookup', datatype='GPValueTable', parameterType='Required', direction='Input') param2.columns = [ ['DETable', 'LookupTable'], ['Field', 'Fields']] param3 = arcpy.Parameter( displayName='Output', name='excel', datatype='DEFile', parameterType='Required', direction='Output') param3.filter.list = ['xls', 'xlsx'] params = [param1, param2, param3] return params

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