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This problem is noticed when using the properties dialog box on a layer or table in ArcMap to set alias names for fields. When using data in ArcMap, some dialog boxes and dropdown lists display the field's alias name, while others display the actual field name. Field aliases are sometimes not carried over when performing operations on the data.
In some cases, the underlying table needs to be accessed instead of the layer or table object in ArcMap. The underlying table is independent of the ArcMap application and does not know about the field aliases set in ArcMap.
The actual field name is used instead of the alias name in the following cases: