Training compensation and solidarity contribution are both training rewards, but they are triggered in different situations.
Training compensation may be due before the end of the season of a player’s 23rd birthday when the player is registered as a professional for the first time or when a professional is transferred internationally. It compensates clubs that trained the player between the calendar years of their 12th and 21st birthdays, subject to the conditions in the RSTP and the FIFA Clearing House Regulations.
Solidarity contribution, by contrast, may apply when a professional player is transferred before the expiry of their contract against payment, whether on a permanent or loan basis. In these cases, up to 5% of the transfer compensation is distributed to the clubs involved in the player’s training. Unlike training compensation, it may apply to each relevant payment made under the transfer.