[求助]位置约束怎么把多个symbol组合成一个component symbol, component, 位置, 求助

Randit

在对DCM的位置进行约束时，提示：

ERROR ack:679 - Unable to obey design constraints (LOC=DCM_X2Y1) which require
   the combination of the following symbols into a single component:
           Dcm symbol "inst_dcm_clk/dcm_clk" (Output Signal = NULL)
           Gclk symbol "inst_dcm_clk/clk0_bufg_inst" (Output Signal = clk0_obuf)
   The constraint fragments target to conflict component type.  lease correct
   the design constraints accordingly.

小弟不太明白怎么做,请指教,3thx