Account move workflow

I met alot of accounting experts and displayed openerp to them. They expect to see a kind of account move workflow (current-->complete-->close-->posted) and eventually posted to GL transaction as amethod of reviewing and approval used by local policies.The transition of the workflow based upon manegerial roles priviliges. Transaction will not have any effects on the rest of the system or reports until it eventually got posted. I am wondering how difficult is this to be applied considering that I am aware of alot of complications this change may impact, however alot of accountant here in our community asking from this functionality and they claimed that this is a must and not luxurey.