Enabling this feature will ensure system calculating project cost price and sales price when posting project transactions adheres to the following rules: i) When Amount including sales tax parameter is set to true, sales tax is subtracted from cost price on the document when calculating Project sales price, except: (a) non-deductible tax percent which is always included into the project cost price and (b) sales tax in US legal entities where Sales taxation rules are enabled in General ledger parameters. ii) When Sales price uses Charges percent method, Sales price is always calculated as percentage of the cost price, including scenarios where Amount including sales tax is set to true. Note that Sales price calculation applies to production/ stocked scenarios only. In resource-based scenarios sales price is driven by the project pricelist associated with the contract. iii) Cost price and sales price values always match in the resulting project transaction, subledger transaction and committed cost.