Repository will permit user to violate 1:n
associations with serious consequences.

Situation:

RefClass X
RefClass Y
Association AXY: end1 E type Y multiplicity (0,-1)
                 end2 F type X multiplicity (0, 1)

RefObject X1 of type X
RefObject X2 of type X
RefObject Y1 of type Y

X1.getE().add(Y1)
X2.getE().add(Y1) // violation of 1:n association

AXY.refAllLinks() = [ X1-Y1 ]
X1.getE() = [ Y1 ]
X2.getE() = [ Y1 ] // inconsistent results

Y1.refDelete()
X1.getE() = [ ]
X2.getE() = // error

org.netbeans.mdr.persistence.StorageBadRequestException:
No record exists with key SOME-MOFID-HERE
	at
org.netbeans.mdr.persistence.btreeimpl.btreestorage.BtreeDatabase.noSuchRecord(BtreeDatabase.java:939)
	at
org.netbeans.mdr.persistence.btreeimpl.btreestorage.BtreeDatabase.get(BtreeDatabase.java:740)
	at
org.netbeans.mdr.storagemodel.MdrStorage.resolve(MdrStorage.java:1568)
	at
org.netbeans.mdr.persistence.btreeimpl.btreestorage.BtreeStorage.resolveObject(BtreeStorage.java:403)
	at
org.netbeans.mdr.persistence.btreeimpl.btreeindex.MOFIDInfo.objectFromBuffer(MOFIDInfo.java:136)
	at
org.netbeans.mdr.persistence.btreeimpl.btreeindex.BtreeListByKey$BtreeListByKeyIterator.getCurrentItem(BtreeListByKey.java:217)
	at
org.netbeans.mdr.persistence.btreeimpl.btreeindex.BtreeListByKey$BtreeListByKeyIterator.next(BtreeListByKey.java:142)

[ this is not from refDelete, sorry, so I will cut
it here ]