The Indo European Urheimat is represented by the Yamna culture or the "Yamna Horizon". The Corded Ware was an offshoot of the Yamna culture that spread across Northern Europe. A Corded Ware Urheimat would theory have meant that the Indo European Language was from Europe, not the Caucuses or the Pontic Steppe region.
North European hypothesis (Nordicism)
The Corded Ware culture appears to have introduced Indo-European languages to a large part of Northern Europe. However, it doesn't appear to have been the origin of the IE languages, because there are no traces of it in Greece, India, or Iran, where IE languages have existed since about the same period when Corded Ware was active.
Therefore, the Corded ...