This issue came up when BZ#833829 was discussed and the suggested solution was to take the RAM value from one of the VMs in the pool. In case the value will be taken from a VM that was edited (and RAM was changed), the value will remain inaccurate.
in gerrit: http://gerrit.ovirt.org/#/c/6482/ The edit button is disabled when a VM which is a part of a Pool is selected.
merged: 9ac33dd43f94fc5d66305caf67719a1b4369ba92
Verified - si12 - editting of VM that belongs to pool is no longer enabled.