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The choice field and lookup field allow for multiple selections. I can't find that option for lookups to external content types. Is it possible to do this?

(I want to assign documents to one or more clients, using a clients list coming from CRM 2011 using ECTs.)

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I haven't been able to test, but at least one other person hasn't found it possible. Does trying MS' suggestion in that thread work? – Alex Angas May 18 '11 at 1:11
Nope, once you select an External List as source for your Lookup the 'allow multiple selections' checkbox is grayed-out/hidden. – Dribbel May 19 '11 at 7:19
up vote 1 down vote accepted

You can create a lookup column based on an external list, but you can't have multiple selections or bring in additional columns. This is a limitation of the external list data in SharePoint 2010.


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