| Variable | 
Select and click Browse to browse for available variables to associate with the parameter. Click New to define a new variable to associate with the parameter. | 
| Literal | 
Select to use a fixed value. | 
| Control | 
Select to use a control that is defined on the screen | 
| Personalization key | 
This is enabled only if the mobile business object parameter has a personalization key associated with it. | 
| NULL | 
Use a NULL value assigned to the parameter.
                         When a parameter has a personalization key or default value, and you set the parameter value to null, the explicit sync parameter always overrides the personalization value and default value. Note: Null does not override personalization key or default values for create, update, and delete operation parameters. 
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| Mobile business object | 
If enabled, the parameters can be pointed to the structured mobile business object shown. |