bad reputation. Reputation is indeed a problem in the SSHIP. You must fight battles in order to release the prisoners - this increases reputation (@Macaras can have more info on this).
recruit_pool "Knights Hospitaller" 1 0.05 2 0 requires factions { jerusalem, } and event_counter knights_hospitaller_buildable 1 and event_counter order_recruitment_enabled 1;====================================================================================================== Orders Recruitment Requirements
;------- Orders Recruitment Requirements
set_event_counter order_recruitment_enabled 0
monitor_event PreFactionTurnStart TrueCondition
set_event_counter order_recruitment_enabled 0
end_monitor
monitor_event PreFactionTurnStart TrueCondition
and GlobalStanding > -0.3
and not FactionExcommunicated
set_event_counter order_recruitment_enabled 1
end_monitor