部件集合号与组元的接触定义问题

请问同一个部件集合号能否与已定义的不同节点组元定义接触？
我定义了一个部件集合号11，它与不同的节点组元面间发生接触，但是dyna提示下面的警告，貌似接触定义不了，望高手指点！！！谢谢
*** WARNING ***
The CONTACT load definition between material 11 and material 0 has
already been defined. The EDCGEN command is ignored.