Get case sensitive spell check to flag rg174

Here are some words that have been added to spelling dictionary:

CD

CDs

FS237E

George

MS417D

RG174

and also many other product numbers that our company wants to follow our capitalization rules.

For the following sentence:

You might find what george has to present in download format on fs237e, but if you prefer cd format then you should consider ms417D.

Case sensitive spell chcek of this sentence only flags "george" and "cd" as misspellings. but not the two products.

Hopefully Indesign can handle this and simply I am doing something wrong.

Thanks, Edward