OIE - changing tax code attached to expense type (new code not defaulting in)

Hi. I was wondering if anyone could help. I have encountered a problem testing the change to a tax code attached to an expense item. In the example below, the expense item is called Other Expenses (Including VAT). It previously had the expense tax OIE VAT attached and it was correctly defaulting into the expenses claim form and working as expected. I changed the tax code to GB Standard and attached it to the expense type on the expense template. Both codes are calculating the same rate value of 20%.  The updated code is not defaulting in the expenses claim form and is retaining the old value if OIE VAT. The new expense code was set up under a separate tax regime but made available to the operating unit the expense item is available under. The operating unit