Can't find support and delete button in transaction matching

Summary

I cannot create support or delete unmatched data in transaction matching

Content

Hi, 

I'm testing on transaction matching functionality for user requirements.

When I review user manual, the manual says I can create support information for an unmatched transaction. 

But I can't find any support button in Unmatched Transaction tabs. (Delete button also missing)

 

Can someone tell me this is a bug or there is a change during update?

 

Thanks in advance