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Cannot create External ID field even when the limit is not reached

Knowledge Article Number 000171517
Description When we create a field and enable it as External ID, we receive an error: Custom Field Index limit reached.
Resolution There are two limits which apply to External Id Fields as External Id fields are indexed by default:

1. Maximum number of External Ids and Unique fields per Entity -   maximum amount of external ID and/or Unique fields permitted per object.

 
*****Default limit: 7
*****Maximum Limit: 10


2. Max Custom Indexes Per Entity -  This limit applies to both the indexes applied by Support and those added through designation of External IDs.

*****Default limit: 7
*****Maximum Limit: 15

Therefore, if the Max Custom Indexes Per Entity limit has been reached, an External Id field cannot be created even if  the Maximum number of External Ids and Unique fields per Entity limit has not been reached.




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