You can change the Total purchase cost to read/write mode, though its join field but if needed we change it to read/write mode, through dev studio.
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The Total purchase cost is the sum of Actual cost and the Sales tax , changing these two changes the total cost however the limitation here is this logic works only for USD. (KA326741)
One possible workaround here is define a currency conversion ratio in the "AR System Currency ratios" form this will give you the total relative cost in USD as per the defined ratio.
Thank you very much to help in on this i hope it would work for customer as well..get back to you soon