None of our general contractors are happy with property owners knowing actual contract amount and being able to calculate GC's markup. We would like to be able to say the contract value was double actual value to avoid losing our GC customers. For example, we charge the GC $2600 for a job, GC invoices the customer for $5000 for the work we did. Can our preliminary notice say that the contract amount is $5000, but amount due is only $2600? Or would this invalidate any future lien action?