In a framework, a default value can be defined for a specific subfield. When editing a record containing a 0 value, this existing value is replaced by the framework defined default value. This can occurs for example, for OpacSuppress subfield if 1 (hidden) value is assigned by default.
http://lists.koha-community.org/pipermail/koha-patches/2010-November/012852.html
Patch pushed, please test and close
An equivalent bug exists in the authorities editor.
Submitted follow up patch for the authority editor.
Patch for authorities pushed, please test and close
This bug has a patch presently committed to HEAD and 3.2.x. Please take the appropriate action to update the status of this bug. Remember, bugs which have been resolved should be tested and marked closed, preferably by the original reporter.
A fix for this bug has been committed to the current development HEAD as well as released in 3.2.1.