By laws SA
During the Summer Season and where clubs have multiple teams in the same division, a player may play in more than one team in that division only as follows;
i) In competitions which do not use promotion /relegation, a player may not move between teams in the same division after round six (6).
ii) In competitions which do use promotion /relegation, a player may not move between teams in the same division within phase 2 or 3. However a player may move to another team during phase 1, or between the end of one phase and the beginning of the next phase.
2.5. Transfer Between Teams in Different Divisions
a) During the Summer season, a player cannot move from any team in any division into a team that is playing in a competition that uses promotion/relegation, during phase 2 or during phase 3. A phase is considered to have started when the first round 1, 6, or 11 game is played in any division, and is considered to have ended when the last round 5, 10 or 15 game is played in any division.
b) During the Summer season, a player can move from any team in any division into a team that is playing in a competition that uses promotion/relegation, during phase 1 or between phases.
c) This restriction does not affect players who have not yet played any games in any team in the current phase.
d) Other than the restrictions above, players may be promoted any number of divisions from one week to the next.
e) In addition to the restrictions above, players can only be demoted one division within an age grade from one week to the next, i.e., from one division to the next lower division in which the club has a team