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When configuring a Cognos shape layer by using a JOIN between a map service and an IBM Cognos field, no results are returned when the map service join field is in integer format.
Currently Esri Maps for IBM Cognos does not support a join between an integer map service field and an IBM Cognos field.
Add a new field to the map service formatted as a string and populate it with integer values. ID values should always be in string format; integers should only be used if some sort of arithmetic operation is to be performed on the field.