"Custom changing tables will be recognized only if their object category is 0x00D5 (213)."

Where do I find that listed for an object, please?

@aelflaed It should be in the init BHAV function of the master tile of an object. A screenshot from SimPe:

Thank you!

Me again...I have altered a couple of custom change tables by swapping in your Function-Init-A resource, or added the object category to the BHAV myself...but I don't think it is working. I haven't observed a single sim choose to walk to the change table. Even when it is beside them, they throw the nappy on the ground. I tried re-purchasing the object.

Did I miss something else that needs to be done?

@aelflaed Make sure you don't use any mod which conflicts with mine, or if the conflicting mod loads in the correct order (see the Conflicts section). You could also attach an example file with a modified changing table.

I think I'm clear on conflicts, but will check again. Thanks.
(...)
HCDU+ finds nothing, and I can't see anything manually that would conflict. I'm using your 'player-directed' variant, in case it makes a difference.

I'll attach one of the files I've messed with.

@aelflaed Function - Init - A is unused and that's the problem. Function - Init - B is used in the object functions resource. I guess Function - Init - A should be used instead, perhaps modified as it's not a two-tile changing table.

Aha! Didn't think of the one-tile-ness affecting things. Will poke it some more.

@Nopke - pointed Object Functions at Init A instead of B...that seems to have worked, thank you for the suggestion. And the mod!

I have uploaded a small set of changetables compatible with your mod:
https://www.pillowfort.social/posts/4981535

Thanks so much for your guidance.