[Svnmerge] How to stop reflected blocks

[Kevin Hanson]

I have two branches that are svnmerge initialized in a bidirectional manner.

How do you keep svnmerge from showing blocks as available.  For example, 
I block r72 from trunk.  Now I go to the trunk branch and do an svnmerge 
avail and it shows r73 available which is the block from the other branch.

What is the proper way to block revisions in a bidirectional setup and 
not have them reflect back and forth.

Cheers,
Kevin