BI Publisher - Elements disappearing from Global Level Function Group

 

In publisher 11.1.1.6 I create an element by expression in the global level function group.  The expression returns a string and is:

IF(FC_1B<=FC_1C,'Yes','No').

When I create it the element shows up at the bottom of the global group which has lots of other elements (70+).  I am able to add other elements too after that.

FC_1B and FC_1C are other elements in the same global group.  I repeatedly save my data model.

However, when I exit my data model, by clicking on "catalog", and then open my data model again,  the elements I added are all gone.