This is the Supreme Court judgment of 20th January 2020 deciding that a pre-22nd February 2019 judgment debt expressed in US dollars can be discharged on and after that date by payment in RTGS dollars on a one-to-one basis.
Note that the legislation referred to in the judgment is available on this website:
1. Statutory Instrument 33/2019 - Presidential Powers (Temporary Measures) (Amendment of Reserve Bank of Zimbabwe Act and Issue of Real Time Gross Settlement (RTGS) Dollars) Regulations, 2019 [hyperlink]
2. Finance (No. 2) Act, 2019 [hyperlink]