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Another technique that would work is using a Python function and dictionary. This requires more initial setup but could be used anywhere you know the value(s) to be matched.

Pre-Logic Script Code:

#create function 
def numberToLetter(ID):
    # create dictionary {'string':'string', number:'string', etc.}
    LookUpDictionary = {1:'A', 2:'B', 3:'C', 4:'D'}
    # process ID in dictionary. "Not Found' is used for undefined
    return LookUpDictionary.get(ID,'Not Found')

Calculated Field:

numberToLetter(!ID!)



--
Thanks,
Eric Smith
GIS Analyst
Fitzgerald & Halliday, Inc.

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