**Service** **ForecastService** [LineItemService](https://developers.google.com/ad-manager/api/reference/v202608/LineItemService.AdProductBookingError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202608/LineItemTemplateService.AdProductBookingError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202608/OrderService.AdProductBookingError.Reason) [ProposalLineItemService](https://developers.google.com/ad-manager/api/reference/v202608/ProposalLineItemService.AdProductBookingError.Reason) [ProposalService](https://developers.google.com/ad-manager/api/reference/v202608/ProposalService.AdProductBookingError.Reason) **Dependencies** [AdProductBookingError](https://developers.google.com/ad-manager/api/reference/v202608/ForecastService.AdProductBookingError) ▼ **AdProductBookingError.Reason**

Reason associated with an error.

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202608`

| Enumeration | Description |
|---|---|
| `AD_PRODUCT_NOT_FOUND` | Selected ad product does not exist. |
| `AD_PRODUCT_NOT_ACTIVE` | Selected ad product is not active. |
| `AD_PRODUCT_PRICING_NOT_FOUND` | Selected ad product pricing does not exist. |
| `AD_PRODUCT_PRICING_MISMATCH` | Selected ad product pricing does not belong to the selected product. |
| `AD_PRODUCT_ADD_ON_PRICING_NOT_FOUND` | Selected add-on pricing does not exist. |
| `AD_PRODUCT_ADD_ON_PRICING_RATE_CARD_MISMATCH` | Selected add-on pricing rate card does not match the primary product pricing rate card. |
| `UNKNOWN` |   |