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I can't get an Enhanced Lookup to work correctly, although I checked all questions and answers in SE so far and:

  1. Enabled Enhanced Lookups on this object
  2. am admin user
  3. Searching for the full values (no wildcard involved) of an existing text field (no non indexed fields)
  4. Added relevant fields to the "Search Filter Fields" list
  5. NO Lookup Filters are "in the way" of finding records

enter image description here

As the next screenshot shows there is nothing wrong with lookup filters here (even if the info message is displayed). Here you see how the record can be found by Name field also showing the text field with the search value "2020".

enter image description here

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    Which object it is for? Also are there lookup filters? – Mohith Shrivastava Jan 11 '16 at 11:34
  • @MohithShrivastava it is a custom object called Price Schedule which has lookup filters...Is that a problem? – Robert Sösemann Jan 11 '16 at 12:04
  • that is correct. you have custom lookup filter enabled – Himanshu Jan 11 '16 at 12:04
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    Yes if you have lookup filters only records satisfying filter criteria will appear. – Mohith Shrivastava Jan 11 '16 at 12:05
  • What type of field is 'Year'? You can only search for certain custom field data types: help.salesforce.com/… – Robin De Bondt Jan 19 '16 at 13:58
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The implementation of Search, Lookup Filters and unseelctive search terms was the root cause. This is the answer we got from Support:

An entity-specific search (e.g. Case, Account, Custom Object) will return at most 250 results. Lookup Filters will then only apply to the top 200 search results. This filtering is performed post-query as it relies on information present in the database but not in the search index. As a result of this, if the desired result does not appear within the top 200 search results, it will not appear in the Filtered Lookup list. This means that the combination of a high-hit-count search (e.g. a search for “Sales*” that returns a thousand results) and a Lookup Filter can cause many “expected” results which are retrievable through more restrictive queries to not show up when using the Lookup search.

Suppose in your org has over 10,000 records that start with the word "Spanish". A search for "sp" returns a max of 250 records and then the Lookup Filters evaluate those results according to the filter criteria. If the 250 records returned in the initial query do not meet the criteria of the Lookup Filters, the lookup search will return 0 results and make it appear as though it is not working as expected even though it is.

Workaround: Either remove the Lookup Filters, make the Lookup Filters less restrictive or use more restrictive search terms.

This is also documented in this Knowledge Article.

That was exactely our case. In a specific customer org (not in any of our dev orgs) we have thousands Period__c records with a text Year field of value "2020".

Period__c records are tied to the Contract__c by using a Lookup filter.

If non of the first 200 returned Period__c records "belongs" to the current Contract__c parent record We get ZERO results.

We think this implementation is absolutely suboptimal and strongly reduces the use cases for Enhanced Lookups. Maybe we or someone else will create an IdeaExchange for that.

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    Don't you just love phrases as "the lookup search will return 0 results and make it appear as though it is not working as expected even though it is"? It requires a specially tuned mind to come up with phrases as these. – Sander de Jong Jan 26 '16 at 10:13

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