Cross validation rules bypassing for mass allocation

Hi All,

We are having 9 segment and we are designing cross vass validation rules with account & sub account.

now while defining mass allocation formaula we will define based on account

EG: 2000 is parent account

2001 :20%

2002 : 20%

2003 : 50%

2004 : 10%

but if we define  cross validation rules based on account and sub account .

while defining formula sub account also will come in to picture . and the business dont want sub account in mass allocation. how to by pass sub account in mass allocation if cross validation rules defined with sub account .

any one please help me with soultion