This bit me hard making me lose some twelve values to custom xowiki parameters. Cause for the parameters that are set to null are below. This a somewhat critical bug due to what it can do.
The upgrade overwrites the sql proc apm__register_parameter from acs-kernel/sql/postgresql/upgrade/upgrade-5.2.0d1-5.2.0d2.sql which has an erratic definition than what's present in apm-create.sql. Should we be using the one on the upgrade or the one on apm-create?
In any case, you can correct the upgrade version by adding an extra where clause "and v.package_id = ap.package_id".
Note that even if Orzenil has dotlrn fixed using a workaround, you still need to fix your erratic apm__register_parameter proc or any attempt to upgrade ANY package which has a null in attr_value from apm_parameter_values will overwrite all similar parameter attribute values using default value from apm_parameters.
I'm not sure if we should be following the one on the upgrade (with the correction) or the one on apm-create. So someone please write a proper upgrade script.
