Definition of causality for English Language Learners. : 1  the relationship between something that happens or exists and the thing that causes it. : 2  the idea that something can cause another thing to happen or exist.
up vote 3 down vote accepted. Copy Source (internal name is _CopySource) field contains the URL of the source document. SharePoint sets this out of the box when moving a file through the UI, though it is settable programmatically too. share | improve this answer. answered Apr 13 '12 at 6:42.
Also if you need to add a reference to an External Content Type, you can create a reference to it when you select External Data as the column type. If we go in depth with the External Data column, once a column is created, SharePoint creates another column referencing the same item with a â_IDâ suffix that will store the current ID of the external content type item.