AI-generated Key Takeaways
- 
          The provided text describes an enum that lists the different fields a simulation can modify. 
- 
          The enum includes options for various bid types like CPC, CPV, percent CPC, and bid modifiers. 
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          Simulation fields also encompass target types such as CPA, ROAS, and impression share. 
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          There are additional enum values for unspecified or unknown simulation fields, as well as for budget simulations. 
Enum describing the field a simulation modifies.
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used for return value only. Represents value unknown in this version. | 
| 
 | The simulation is for a CPC bid. | 
| 
 | The simulation is for a CPV bid. | 
| 
 | The simulation is for a CPA target. | 
| 
 | The simulation is for a bid modifier. | 
| 
 | The simulation is for a ROAS target. | 
| 
 | The simulation is for a percent CPC bid. | 
| 
 | The simulation is for an impression share target. | 
| 
 | The simulation is for a budget. |