How to make a "locked" or debug Item buyable

Got it!
Ok, so when first testing your item in game it doesn't worked for me either. So I first checked your item and saw the following things: (Although after changing those, I still got the same problem of the dissapearing item in game)
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First thing I noticed is that you didn't changed the colortags. The bed itself is red/white-ish, but it still got the blue-grey tags.
That doesn't really matter for your problem, but it's something you can think about to change.

When taking a look at the warehouse and then the object catalog line, the devcategoryflags line in the common section, still ends with A0. Maybe you already changed this to 80, but it changd back somehow, so I re-entered the 80 at the end.

Then scrolling all the way down to the unused2 section, you got both Build as Comfort tagged. (I know this is standard for this bed)
But as this is a bed, it belongs in the buy section and not the build section, so I unchecked "Build" and left Comfort checked.
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So after checking your item, I always start all over again to find out if it's a problem in Studio.
In this case it certainly isn't, as I got it to work just fine.

One important thing to remember when modding items, is that you can make mistakes somewhere in the process by accident that you didn't plan and probably even didn't notice. So first thing you should always do after you find out your object doesn't work as supposed to, is restarting your project and see if that already fixed te problem.

As this tutorial is a bit outdated, you could also watch my video tutorial here on the forum which can be found right here, those are almost exact the same steps, but in a newer version of Studio: How to Unlock Objects ( Debug / World )

What I did different from this tutorial, is that I used the Overwrite option in the main menu so I've got all the original bed recolors too. Because of those multiple swatches, I had to change every object catalog line instead of only one, like mentioned at the end of this written tutorial.

So my solution to your problem would be, try to re-do your steps with the newest version of Studio and see if this fixes your Item.
If not, we're going to find out where it go's wrong.

I think I ran into a weird issue – if an items's DevCategoryFlags line is ending with A1, after changing it to 80, saving and reopening it's suddenly ending in A0. After changing it to 80 again, saving and reopening, it's stuck at A0. I tried multiple times – if the DevCategoryFlags line is ending with 81, I can change it without any problems and it sticks, but A1 is for me impossible to change. I tried it with overrides, mesh cloning and standalone recolors. Any suggestions please?

Hmmm, I haven't checked before, because I assumed it must end in "80", but I tried it now and it does! Sorry for the confusion! And thank you!

i wanted to make the empty nectar glass full but the buydebug dosnt work on studio saying wrong code please help?

i have harmony 3.0.1.9
i dont see the check box x.o;

i'm trying to extract some fruits (pears, apples...), after the process i can see the pear in my catalogue but it looks strange when i try to put it in my house, i can see only a sort of shadow. the texture of the pear is a multiple texture that includes various type of fruits, is this the problem? i tried to cancel other fruits textures and the pear looks right in sims studio, but wrong in game.

There's a check box in the current Mac version, like there is in the current Windows version.