When a filter has been implemented on a lookup field, users may find that they're unable to locate related records via the lookup dialog search when they create a new record despite records existing and matching the filter's criteria. Users will also find that the same lookup search returns the expected records upon editing the newly created and saved record.
For Example:
1. Create a custom lookup field on the Case object to Opportunity.
2. Create a custom lookup field on the Quote object to Case and add a filter with the following criteria:
Quote: Opportunity ID equals Field Case: Opportunity: Opportunity ID
3. Create an Opportunity record and then several Case records associated with the Opportunity.
4. Open the Opportunity created in Step 3, and create a new Quote record via the Quotes-related list.
5. In the Case lookup field, try to search for the cases you created in Step 3.
When you create the Quote record, you're unable to locate the Case records via the filtered lookup. However, if you click "Show all results" to remove the filter the expected results are returned or if you input a matching case number into the lookup field on the Quote edit page (without searching) you're able to save the record and the lookup filter works when editing an existing record.
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