WorkFlow Message Datastructure Disabled in JDE E812 Version


Hi, One clarification on JDE if anyone could tell me. Its related to Work Flow Message.
I am unable to see the Third tab namely “Data Structure Template” as it was disabled so could not find what data structure using by this work flow message(LM55XXXXX). System is showing the same for all workflow messages not only to this.
We are using JDE E8.12 version and I could see the same tab enabled in JDE E9.0 version. Can anyone say whether we could add or edit workflow message data structures in JDE E8.12.
Path : Fast Path ->Enter DD ->Choose work flow messages -> enter LM55*->open and check third tab.