CUA "Text comparsion from child systems Tab" is missing!
I am trying to create CUA between central system and one child system, both are SAP NW 7.4.
After having generated the CUA, in the display logs all messages are green, but in the last message instead of getting "text comparison was started", I got the following message: "Child system does not support change documents for the CUA landscape" and this message is also GREEN.
In the user maintenance, I am able to see the new "System" TAB, but in Roles I cannot see the "Text Comparison from child Systems"!
A logical origin could be that your SCUM settings have roles as "local"? But I guess you would know that, as you did not mention it??
You will have to set it to global before the button appears.
Go to the technical message class / number and search on SMP for any SAP notes related to it. Also make sure your master system is on a higher release / SP than the child (backward compatibility is generally more supported than upward compatibility).