Some ideas, I don't know if it works:
in your validation method, change
NSArray *allSpecies = [self.managedObjectContext
executeFetchRequest:allSpeciesIDsFetchRequest error:nil];
NSArray *allCatalogIDs = [allSpecies valueForKeyPath:@"catalogID"];
if ([allCatalogIDs containsObject:*ioValue]) {
to something like
[allSpeciesIDsFetchRequest setPredicate:[NSPredicate
predicateWithFormat:@"catalogID == %@", *ioValue]];
NSArray *species = [self.managedObjectContext
executeFetchRequest:allSpeciesIDsFetchRequest error:nil];
if ([species count] > 1 ||
[species count] == 1 && [species objectAtIndex:0] != self) {
NSTextField can have a delegate which can implement
- (BOOL)control:(NSControl *)control isValidObject:(id)object
Willeke
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