A single operation (create, update, remove) on a campaign budget.
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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 budget.  | 
              
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                   Update operation: The campaign budget is expected to have a valid resource name.  | 
              
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 Remove operation: A resource name for the removed budget is expected, in this format: 
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