BCS and a Lookup column in another list pointing to the BCS

Hi,
SP 2010 Server.
Say I create a BCS to a line of business database with one Table named Customers.
Customers has an ID column and FullName column.
I create from this BCS an external list created in SP (say ExternalCustomers).
I create a standard SP List named InternalCustomers.
That list has a lookup field named CustomerName that is a lookup to the FullName column of the BCS ExternalCustomers list.
Is this possible? When the user chooses the FullName in the InternalCustomers list is he presented with a choice of fullnames from the ExternalCustomers list?
I am confused because of this statement from
here
11) Not everything from Lookups
Unfortunately the only thing that you can do a look up on in an external list is on the ID column, anything else and you are out of luck.
Thanks,
Maz
Maz

Hi,
According to your description, my understanding is that you want to look up External Data in the Customer list.
I suggest you can add the "External Data" column in the list to access the external content type to look up the field you need.
Here is a detailed article for your reference:
How to: Create a SharePoint List with External Data Columns
Thanks
Best Regards
TechNet Community Support
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Issue with site template that contains a document library with a lookup column to another list

I have a document library called Proposals with a lookup column in the same site called Document Categories (multiple values allowed). It points to a list called document categories. I have several sample documents in the Proposal Library that
contain valid document categories. When I save the site as a template and instantiate it, everything is fine. However, when I remove the sample documents from the Proposal library and rebuild the site template, I can't get the template to
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I don't understand why I can instantiate a site from the template when there's sample data, but not when the document library containing the lookup column is empty.
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Why would it make a difference if the library is empty?
Thanks

Hi,
According to your description, my understanding is that the error occurred when you created a site from the template with no files in the document library.
I tested the same scenario per your post, and I can create a site from the template with no files in the document library with no errors.
To solve this issue, I recommend to verify the things below:
Did you save the site as a template with Include Content checked? If yes, I recommend to test if it works when saving the site as a template with Include Content unchecked.
Test the same scenario with a new site to narrow the issue scope.
I also recommend to check the event log and ULS log to see if anything unexpected occurred.
To check event log, click the Start button and type “Event Viewer” in the Search box.
For SharePoint 2010, by default, ULS log is at C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\LOGS.
You can check the ULS log by the methods here:
http://blogs.msdn.com/b/opal/archive/2009/12/22/uls-viewer-for-sharepoint-2010-troubleshooting.aspx
http://msdn.microsoft.com/en-us/library/gg193966(v=office.14).aspx
Best regards.
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Victoria Xia
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Best practice to code Lookup Field to another list

Hello All,
Wanted to check what is the best way to create lookup field to another list. I have seen blog posts to create using feature receiver and using declarative way, but not able to find out pros and cons for the same. Want this answer urgently.
Rohit Pasrija

Hi,
Per my understanding, you might want to find a better way to create Lookup field.
Though there are different ways to create Lookup field(declaratively or programmatically), there would be no much difference between them in performance or maintenance.
If going in the declarative way, the whole definition of the field will be hardcoded, user simply need to deploy the solution, Lookup field to a specific list will be there.
If creating the field programmatically, there would be great flexibility when provisioning a field as we will be able to specify the properties dynamically.
Thus, you might need to make a choice depends on the scenario in the actual production environment.
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Patrick Liang
TechNet Community Support
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[email protected]

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Hi,
I am trying to autonumbeirng the column id with default column ID. But it is not reset if i delete the list item. Also i want this id in another column which have status="Active". How i will do this?
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Hi,
According to your description, my understanding is that you want to reset the column ID when you delete the list item and then you want to filter the id in another list based on status.
For resetting column id, there is no direct way to achieve it. I suggest you can save the list as a template and recreate the list. ID columns will always keep incrementing and will never be reused.
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https://social.technet.microsoft.com/Forums/sharepoint/en-US/848a3d73-6273-45fa-806f-96312a4d71d1/is-there-anyway-to-reset-the-default-id-number-that-sharepoint-gives-to-an-item-back-to-1?forum=sharepointgeneralprevious
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[email protected]
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Lookup Column Threshold in List in O365 (Sharepoint 2013)

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Hi i have a list with two columns as student id and student name. in second list am
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How to add a column to a list created with the Dynamic List Wizard to display the values of the fiel

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1.     Start transaction PM01, Create Infotype, by entering the transaction code.
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When you specify the infotype number, please remember to enter any leading zeros.
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BCS and a Lookup column in another list pointing to the BCS

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