Make operation apply calls set updated, to suppress QC

vdmj/src/main/java/com/fujitsu/vdmj/po/expressions/POApplyExpression.java

@@ -96,7 +96,10 @@ public ProofObligationList getProofObligations(POContextStack ctxt, POGState pog
 		{
 			if (type.isOperation(location))
 			{
-				pogState.addOperation(location, opdef);
+				// We have to say that the POGState is as if the operation updates state, because
+				// it may read state even if pure, and an apply uses the return value. So QC can't
+				// evaluate them. This makes subsequent POs Unchecked.
+				pogState.setUpdateState(true, location);
 			}
 
 			if (type.isMap(location))