MADescription beHidden don't update model

Hi, i have a model with some descriptions. One of it, descriptionMap, is set with beHidden property because i think to use it only for update the relative cache description into descriptionContainer. The relative code is : ^( super descriptionContainer ) addCondition:[ : memento| memento cache at: self descriptionOK ifTrue: [ memento cache at: self descriptionMap put: 'xyz'. true ] ifFalse:[ false ]. ] labelled: 'Error is not ok; yourself The cache is right update. The problem is to update the model relative to the descriptionMap cache. When confirm the form other instances model is right update but descriptionMap not. Any idea? Thanks, Dario