How to purge informal positions from hierarchy.

My RPAS version is 13.2.2.37

I have some user defined place holder positions in a hierarchy. Now the positions are useless and we plan to purge them.

We tried two ways.

1) prepare a hier file with positions that we want to keep;

run command like "loadHier -d <dom_path> -load <hier_name> -purgeAge 0"

it returned a success, but actually the positions still existed in the hierarchy.

2) then we found the positions are informal ones, so that we prepare dpmposupdate.xml and ran updateDpmPositionStatus, which returned a success, too.

But we run exportHier with "-onlyInformal" option, which shew that the positions are still informal. And we repeated the first way and got the same result.