Display SubTotal Before Tax on Receipt

@Emerson wrote:

Need to display SubTotal before taxes on the ticket.
Using
SubTotal:|{PLAIN TOTAL}
{TAXES}
Total Impuesto:|{TAX TOTAL}
Total:|Lps.{TICKET TOTAL}
{CALL:num.numToSpanish('{TICKET TOTAL}')}

However Plain Total reflects no value.
Have prices set to include taxes in configuration.

How cn i display the total before taxes?

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