Via the Bell Beaker Blogger:
It is noteworthy that the R1b occurred first after the Middle Chalcolithic in Transdanubia. (Late Chalcolithic has not been not examined yet, and so a hiatus remains between the Middle Chalcolithic and the Early Bronze Age data.) The two R1b samples are dated to the Vučedol period (~2,870-2,580 cal BC) and to the Gáta/Wieslburg culture (~1,950- 1,760 cal BC). R1b is the most frequent haplogroup in today’s Europe, with a frequency peak in Western Europe (Balaresque et al., 2010). From prehistoric context, this haplogroup is known from the Late Neolithic Central Germany (Bell Beaker culture, Lee et al., 2012). The theory that R1b reached Central Europe (and possibly the Carpathian Basin as well) with the Bell Beaker migration, starting from southwestern Europe (Brandt et al., 2014) seems to be collapsing, as R1b (M269) has recently been found in Yamnaya (3,300-2,700 cal BC) population on the Russian steppe as well (Haak et al., 2015).
The other Vučedol period sample belongs to I2a2. Also worth noting is the J2 from the Late Neolithic Sopot/Lengyel remains.
Source: Szecsenyi-Nagy, Anna (2015) Molecular genetic investigation of the Neolithic population history in the western Carpathian Basin, Dissertation