This article explains how to request an increase to the maximum number of External ID fields allowed per object in Salesforce. External IDs are custom fields marked as unique identifiers that help integrate Salesforce with external systems. Some organizations with complex integration needs may require more External ID fields than the default limit allows per object. For example, an organization integrating with multiple external platforms such as an ERP, a billing system, and a support tool may need to designate more External ID fields on a single object to accommodate all their external record identifiers.
Professional, Enterprise, Performance, Unlimited, and Developer
Submit a limit increase request with Salesforce Support
Review Maximum number of External IDs per object or entity and confirm you have reached the default limit on your object before submitting a limit increase request with Support.
To increase your External ID limit beyond the default per object, you'll need assistance from Salesforce Support.
If you've reviewed all relevant documentation and still need assistance with increasing this limit, please have a System Administrator create a limit increase request with Support.
When submitting the request, please provide:
000386651

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