if(selected(${prod}, 'Roundup_ProActive') and selected(${surface}, 'surface1'), '10', if(selected(${prod}, 'product1') and selected(${surface}, 'surface2'), '20', if(selected(${prod}, 'product2') and selected(${surface}, 'surface1'), '100', if(selected(${prod}, 'product1') and selected(${surface}, 'surface2'), '200', '11'))
It only works the first part (with a non sense element such 11):
if(selected(${prod}, 'product1') and selected(${surface}, 'surface1'), '10', if(selected(${prod}, 'product1') and selected(${surface}, 'surface2'), '20', '11'))
Really don't know what to do.