public String addPosition(Position p) {
if (isDataEditable(ResUnit.Position)) {
String newID = getDataSource(ResUnit.Position).insert(p); // persist it
if (!hasDefaultDataSource(ResUnit.Position)) p.setID(newID);
putPosition(p); // ...and add it to the data set
return newID;
} else return fail("External Position dataset is read-only");
}
