One of our custom SharePoint Designer workflow activities, which have always worked fine in SharePoint 2007, fails to validate.
This appears to happen when a Workflow Activity that contains a StringBuilder field also contains a lookup variable.
<FieldBind Field="CustomCode" Text="this code" Id="1" DesignerType="StringBuilder" />
For example when we store the following in this StringBuilder field
"Today's date = [%Current Item:Transaction Date%]"
This field returns 'null' in the ActivityValidator. As a result we cannot validate its contents.
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