I am wondering if Microsoft, in their infinite wisdom, came up with some
alghorithm that determines if a named range is valid or not.
I am trying to systematically create range names based on equipment names in
our system. One of which is "BS4".
My macro will create the named ranges fine but it appears to be an invalid
name that Excel does not like. I have also seen that "HF4" is also a named
range Excel does not like.

Can anyone tell me if there is a reason for this and a way around it?

My macro is building 3 tiers of named ranges to use in 3 dropdown boxes.
The 1st dropdown has the parent equipment, 2nd has the sub parent equipment,
the 3rd has the child equipment of the sub parent. ALL of the named ranges
are unique.
The 1st dropdown selects the parent equipment of which each is a named
range. The 2nd dropdown box reads the Named range in the 1st box and using
Indirect reads the related list I want.
The 3rd dropdown reads the value in the 2nd dropdown as a named range and
selects the related list. However, "some" named ranges do not show anything
in the list. When I check the named range, it is one of those that Excel
does not like.

Any assistance is most appreciated !
--
Edwin Kelly
Houston, TX