Custom BDC External Data column errors “No exact match was found”

Question

I've created a custom BCD for SharePoint 2010. It works well, i can create a list, view all the items, click on an item and view it.

I am now adding this to a list as an External Data column. The column adds, and the picker works, I can see all that I need. When I select one of the items, however it errors. The field value shows the BCS ID, __bk82000300030003000300030003006300530063009300, and the error below

No exact match was found. Click the item(s) that did not resolve for more options. You can also use Select button to choose External Data.

Any ideas?

Thanks, David

Answer 1

Resolved it.

My ReadItem method was using Linq to get me item, but using .Single(). There are duplicate records in my list, so I changed it to .First() and then all is well.

Thanks,

Answer 2

Set any columna "name" as Title. In sharepoint designer->external content type->fields->select field that you show in associated field