I have a problem in checking multiple conditions in my openoffice report for openerp in my report i need to check conditions and prints the results.

my condition is.

[[ (l.invoice_line_tax_id.name[0] =='5 %' )and formatLang(l.price_unit /1.05) or (l.invoice_line_tax_id.name[0] == '14.5 %') and formatLang(l.price_unit/1.44) or formatLang(l.price_unit) ]]

in this first check tax name == '5 %' then print l.price_unit/1.05 then evaluate the or condition if tax name == '14.5 %' prints the value of l.price_unit/1.44, else print l.price_unit.

But there is a problem in my report it works fine when tax name == '5 %' and print its corresponding value, then it evaluate the false condition by printing the else value (l.price_unit) , It does n't evaluate the or condition (or (l.invoice_line_tax_id.name[0] == '14.5 %') and formatLang(l.price_unit/1.44)) .Any one please help me to find the solutions.