No Open Amount in P03B102

A similar question was asked four years ago and we are having the exact same problem today.  I am re-asking the question because the solution four years ago (turn on multi-currency) is far from ideal.

When processing cash receipts in AR, we can see the Gross and Open amounts on the Select Invoice screen but once returned to the Receipt Entry screen of the P03B102, those fields are blank.  The only workaround is to memorize which amounts go with which invoice numbers prior to returning to the Receipt Entry screen.

The issue appears to be because the invoices have a currency code associated with them even though multi-currency is turned off.  Looking in the F0010 and F03012 all companies and customer master records have currency codes associated with them.  Multi-currency has never been turned on for this environment so it's a mystery how and/or why it's populating these currency code fields.  Adding new customer master records with multi-currency off still populates the currency code field.  As noted, turning on multi-currency would likely fix the problem but is there another solution that would have the system correctly NOT assign a currency