Derivate the Clearing Account from MAss Additon and Manual Addition

  Hi:

I need to create an Account Derivation Rule with the next caracteristics:

1) When I make a Mass Additions the Asset Clearing account is diferent that Assets Category.

2) When I create a manual addition the Asset Cleating accounting is taken from the Assets Category.

3) When I run the Accounting from Additons Assets the value from the Assets Clearing  from the Mass Additions is taken from the Mass Additions value and when I create a manual additions the Assets Clearing  is taken from the Asset Category Assigned.

Thanks in advanced.

Rafael.