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Bhushan Mahajan 5Bhushan Mahajan 5 

How many external lookup create in salesforce.

How many external lookup create in salesforce.
 
bob_buzzardbob_buzzard
The limits are documented here:

https://help.salesforce.com/apex/HTViewHelpDoc?id=limits_external_data.htm&language=en_US

but there's no mention of that, so I'd expect it to be the same as the total number of lookups allowed for the object.