In addition to the discussion on the desirability of having % available as a unit, I have a need to develop quantities that numerically have a unit of 1, such as per unit (pu), with pu:=1, and 1 pu = 100%. It is straightforward to define custom unit pu. However, the problem is that I end up getting numbers such as 16.60% pu (see below, should be one unit or the other, pu or %, not both):

Curiously, if I click on the pu designation at variable X__dppv , Maple Flow removes the pu duplication and somehow knows that % is the intended unit:

Percent_Ex.zip

For a document that extensively uses per unit and % quantities, it is a lot of extra work to have to evaluate the decimal quantities first, then changing to % in the context menu, and then manually correcting all of the display issues with % and pu conflicts. Maple Flow does not seem to "remember" the result of the manual unit selection described above between file editing sessions. It also does not remember several other things related to formatting, container placement and spacing, column vectors not retaining a manually adjusted width, and section layout, but those are different issues. 

I have noticed other examples of not remembering the correct units. For example, I have calculations where Maple Flow automatically returned a unit of 1/S in an initial calculation evaluation and I changed this in the context menu to ohms. Similar to the above discussion, upon re-opening the file, 1/S units appear. I cannot get that issue to consistently repeat, so it is not in the example Maple Flow document attached to this post, but the end result is the same - lots of re-formatting of the document from editing session to editing session.

It would be nice if Maple Flow could recognize units that are numerically 1 so that they can be defined for display/documentation, added as necessary, but the result computed such that it is multiplication by 1 with no extra unit added. For example, enter 0.166 pu such that it evaluates to 0.166, with the option of then displaying as a percentage or re-displaying as per unit using the context menu. It would also be nice if Maple Flow could consistently remember the last retained unit used in an editing session as well as all document formatting. 

Thanks