Custom command not working "DD" for DIMLINEAR

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Using AutoCAD 2018 full version, I have changed a number of shortcut keys to my likes. But one of them doesn't stick, namely the DIMLIN command.
I changed it to "DD". I did so using the command "ALIASEDIT", changed the alias to be "DD" instead of "DIMLIN" which is the DIMLINEAR command.
When I type "DD" in the command line in CAD, it acts like it took the command (ie. it doesn't give me the "unknown command" error), but it doesn't do anything. So, I thought maybe it didn't take the change I made using "ALIASEDIT", so I opened the acad.pgp file, checked it there, it was all good. Closed CAD and reopened, still doesn't work! Tried changing it to something else, like "ZZ", and IT WORKS!! So why won't "DD" work???
Been using CAD for 20 yrs or so with "D" or "DD" for DIMLIN, would be nice to keep it that way!
Any help would be greatly appreciated!