* instead on placeholder. */
final ConstraintPHInfo cphi;
if (parent.isConstraintPlaceholder()) {
cphi = (ConstraintPHInfo) parent;
final ServiceInfo si = cphi.prevInSequence(serviceInfo, false);
if (si != null) {
vP = getVertex(si);
}
} else {
cphi = (ConstraintPHInfo) serviceInfo;