These errors can be safely ignored.
The component limit switching errors only occur on -1 and -2L speed grades for Kintex-7 and Virtex-7 devices.Following are some examples of the physical resources that could possibly show the error:
u_mig_7series_v1_2/u_memc_ui_top_std/mem_intfc0/phy_top0/u_mc_phy_wrapper/u_mc_phy/phy_4lanes_0.phy_4lanes/byte_lane_B.byte_lane_B/phaser_out/FREQREFCLK
u_mig_7series_v1_2/u_memc_ui_top_std/mem_intfc0/phy_top0/u_mc_phy_wrapper/u_mc_phy/phy_4lanes_0.phy_4lanes/byte_lane_A.byte_lane_A/phaser_in/FREQREFCLK
u_mig_7series_v1_2/u_memc_ui_top_std/mem_intfc0/phy_top0/u_mc_phy_wrapper/u_mc_phy/phy_4lanes_0.phy_4lanes/byte_lane_B.byte_lane_B/out_fifo/RDCLK
u_mig_7series_v1_2/u_memc_ui_top_std/mem_intfc0/phy_top0/u_mc_phy_wrapper/u_mc_phy/phy_4lanes_0.phy_4lanes/byte_lane_B.byte_lane_B/in_fifo/WRCLK
u_mig_7series_v1_2/u_memc_ui_top_axi/mem_intfc0/phy_top0/u_mc_phy_wrapper/u_mc_phy/phy_4lanes_1.phy_4lanes/byte_lane_B.byte_lane_B/phaser_in/MEMREFCLK
This issue is scheduled to be fixed in MIG 7 Series v1.3 inISE software release 13.3.