Fiscal Rules are invented.
There are no rules, they are self imposed.
Any country with its own currency can create money whenever it is needed providing inflation is controlled by tax and the money has a purpose for use.
Financial Times:
"As is the norm in Britain: the average lifespan of a UK fiscal rule is 3.8 years ā the shortest across the OECD".
https://www.ft.com/content/f902e07b-00ec-4be2-9eca-0710ca754c6b