There is a good chance you’ll run into this error now and again when working with BCS Business Connectivity Services and External Lists:

Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.

Correlation ID:{correlation GUID}

If after looking for the Correlation ID in your logs you find the following error:

The Microsoft Secure Store Service application Secure Store Service failed to retrieve credentials. The error returned was ‘Target application not found (application id: {SecuredStoreApplicationID}).’

It may be an indication that you’ve not established an association between the Secured Store Service Application and your Web Application.

To check your associations go to Central Administration > Application Management and click on “Manage Service Application Associations”

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Look in the “Applications Proxies” Column for your Secured Store Service Application

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Keep in mind that you may have configured more than one Secure Store Service Application, and even if one is listed, it may be the wrong one; in which case you’ll need to change the association. You can change the association by changing the default Application Proxy Group, (clicking on the “default” link,) but beware that this would change it for all of the default associations. Alternatively you could create custom associations for your Web Application. But the better alternative (if a “default” Secured Store has already been established) might just be to re-create the Target Application in the “default” Secured Store.

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