I have a Data Flow task containing several steps. If I break the logic of the flow ie to insert another lookup, the flow starts validating and generates more than a thousand errors in the error list. The most ignoring thing is that it starts counting at 1 error to let's say 1000 and than you see it start counting at 50 and increasing to 1000. Each loop starting at a higher number. All in all this can last for several minutes. All errors are: 'Validation error. <Data Flow Task Name>: The metadata for "input column "" (<ID>)" does not match the metadata for the associated output column.' (The Data Flow Task contains a lot of Union All transformations)
I already set the DelayValidation property of the Data Flow and the package to true, but this does not change the behaviour.
Is there a way to stop this behaviour?