...
SUM(overlappingReservations, B25LP__Quantity_For_External_Client__c) + B25LP__Quantity_For_External_Client__c > B25__Resource__r.B25__Capacity__c
...
Features not supported by Conflict Rules
“Unshared conflict checking” Shared vs Unshared Conflict Checking
Timeslot picker Time Slot Picker (for record pages)