If banks pay interest for the deposits that you hold on the bank account to your company this interest might be reliable to withholding tax. In Korea this tax is refundable (or better: offsetting with the tax to be paid). The company has to file a report on the refundable tax that can be created with the report RFQSKR06.
Post the interest and the refundable withheld tax by using the reference1/2/3-fields like the sample below. Customize the reference fields with field status groups so that they are open for posting.

Posting example:
DR: Bank (interest payment) 80,000 KRW
DR: Refundable withheld tax 20,000 KRW
Text-field: Interest
Reference-1: Basis amount
Reference-2: Tax rate
Reference-3: Koram Bank
CR: Interest earnings 100,000 KRW