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Michael SMichael S 

Custom Field naming

When I created a field in a custom object named "Reciprocal", a custom field named Reciprocal__c is created.

When one of my customers does the same thing, the custom field is named Rec__c.

How do I reliably determine what the field will be named?

adamgadamg
The API field name is specified in the field creation wizard, and always takes the form of NAME__c; if you and your customer have different API names, then you and your customer have different field names.