A single operation (create, remove, update) on an ad group bid modifier.
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                   FieldMask that determines which resource fields are modified in an update.  | 
              
Union field 
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                   Create operation: No resource name is expected for the new ad group bid modifier.  | 
              
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                   Update operation: The ad group bid modifier is expected to have a valid resource name.  | 
              
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 Remove operation: A resource name for the removed ad group bid modifier is expected, in this format: 
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