Nie można dodać typu „<var>Type Name</var>” do listy znanych typów, ponieważ istnieje inny typ „<var>X</var>” o takiej samej nazwie kontraktu danych „<var>Y</var>:X”.

Type '<var>Type Name</var>' cannot be added to list of known types since another type '<var>X</var>' with the same data contract name '<var>Y</var>:X' is already present. If there are different collections of a particular type - for example, List<test> and Test[], they cannot both be added as known types. Consider specifying only one of these types for addition to the known types list.</test>

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