The 'arrival' of Racing Point Force India in the middle of the Formula 1 season is a highly unusual event that has required some complex rules to be navigated.
The process of a new team joining the world championship, last undertaken by Haas in 2016, is a highly complex one, and few F1 insiders believed that it was possible mid-season.
But the FIA's sporting regulations leave a little-known door open for a late entry, and Force India - with the full support of the governing body - has been able to use it.
The option is so unusual that the FIA didn't actually have a late entry form for the team to use.
The FIA and Liberty had to follow a legally watertight process, and not just in terms of how the nine other teams would view it. They had to ensure for example that if a Force India was involved in a serious accident no one could claim that the car shouldn't be on track.
This was a highly unusual case, with no precedent, and therefore it establishes one.
It's important to note, though, that it won't become a licence for struggling teams to walk away from debts in the middle of the year and re-emerge with a new identity.
Lawrence Stroll's original plan was to buy the team as a going concern, go through the legal process of taking it out of administration, and then arrive at Spa pretty much as if nothing had happened.
That strategy was derailed largely because of the legal situation of shareholders Vijay Mallya and the Sahara Group, and the involvement of 13 Indian banks in agreeing to what happens to their assets.
Agreement for the sale to Stroll could not be completed within the two-week deadline set by the administrator, so at the last minute it became not a share sale but an asset sale, with Stroll acquiring the cars and everything else needed to go racing through a new company - called Racing Point.
He therefore had a team, but not an entry, which was still tied to the original Force India company and consequently the Mallya and Sahara shareholdings. The only option was to enter as a brand new team.
The key to the success of the whole process is that the FIA was given guarantees that all the original Force India team's creditors would be paid by new owner Stroll, that the 400-plus jobs were safe, and that there was a sound business plan - one that was not relying on future F1 prize money income.
The first step that the FIA used was an investigation into the original team under its 'judicial and disciplinary rules', in essence because the original Sahara Force India was no longer able to compete.
In its statement the FIA noted that "following a disciplinary investigation and prosecution by the FIA under article 4 of the FIA's judicial and disciplinary rules, the Sahara Force India F1 team has accepted its exclusion from the 2018 FIA Formula 1 World Championship with immediate effect, due to its incapacity to comply with article 8.2 of the sporting regulations moving forward, and forfeits all constructors' championship points under article 6.2."
The specific part that Sahara Force India could not comply with was article 8.2.f, which says that when entering the championship a team has to give "an undertaking by the applicant to participate in every event with the number of cars and drivers entered."
Clearly that was no longer possible as the team had sold its cars and other assets.
Article 6.2 referred to by the FIA meanwhile is simply a basic reference to points: "The title of Formula 1 world champion constructor will be awarded to the competitor which has scored the highest number of points, results from both cars (see article 8.6) being taken into account."
Having cancelled Sahara Force India's entry, excluded it from the world championship and ended its history as an active F1 team the FIA then had to find a way for its replacement to enter at Spa under the Racing Point Force India name, with the same cars.
As reported on Wednesday night, the key in the sporting regulations is article 8.1, the first part of the section that refers to "competitors' applications."
Initially it spells out how entries have to be submitted by November 1 of the previous year, with the entry fee - calculated on points earned - paid by November 30.
Crucially article 8.1 then goes on to note the little known fact that late entries can be accepted: "Applications at other times will only be considered if a place is available and on payment of a late entry fee to be fixed by the FIA."
Clearly a place was available - what we haven't been told so far is the size of that entry fee, but it is understood to be a significant sum.
The FIA says that the new team has complied not just with article 8.1, but also with article 8.2 - the basic requirements that apply to any entrant.
That also explains why Force India remains part of the team name, alongside Racing Point, because under the regulations it is impossible to change a chassis name in the middle of the season.
Those entry requirements are as follows:
"a) Confirmation that the applicant has read and understood the regulations and agrees, on its own behalf and on behalf of everyone associated with its participation in the championship, to observe them.
"b) The name of the team (which must include the name of the chassis).
"c) The make of the competing car.
"d) The make of the engine.
"e) The names of the drivers. A driver may be nominated subsequent to the application upon payment of a fee fixed by the FIA.
Plus as noted earlier there's an "undertaking by the applicant to participate in every event with the number of cars and drivers entered."
All of these items were easily ticked off, allowing the FIA to finally sign off the Belgian GP entry list on Thursday afternoon - the first official sign that Racing Point Force India is in business.