Correct Tax amount

Hi! Our ward had our Christmas party and the original price of the catering was paid for before the event (the Sub Total) and later on the tax was paid by a member of the bishopric on a separate check. I am trying to produce a check for this reimbursement but MLS is saying that I have over 20% of a tax on the original sub total. This is not an error so MLS indicated that I should contact clerk support in order to find a solution. What should we do if we only have the tax amount we need to reimburse?

I would do as instructed and contact support.

Thank you so much! Where would I find the contact information for support?

Thank you so much!