Work Flow approval for GL Manual Journal

HI  Good Evening

We are using R12.1.3.

In our  account segment values  we have 5 accounts which are for our group companies ( Sister company account)

GL user doing transaction on these accounts.

Now the Finance manager  want to have his approval  for   any entry on these 5 accounts only.  ( other  account combination journal can go as usual)

As work around we created  security rule and applied on particular  user - so that this particular user cannot post on these 5 accounts. But this is not enough

DO we have any kind of workflow to initiate and  get approval ( one level approval is enough)