Error: Cannot copy blob fields - no lookup specified and column is WriteOnly

Error is raised when trying to copy a row. Message says, that there is lookup missing (I guess it is the same lookup, that is used when specifying blob control), but where should I fill it?

It’s quite a new functionality. Before it - it wasn’t possible to copy entities on Screens where blob fields were defined as WriteOnly at all. The blob data wasn’t simply present in the dataset to copy and system on this level isn’t aware of UI elements defining the lookup. So we have to tell to the system where to get the data from. So filling the ‘DefaultLookup’ property of blob entity column with the same lookup as in blob control should make the copying work.

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