Question - is this assigned house and unit code usable is some way within the interface or the AHP software?
You can create security macros using this address as it's base before you select the DS10A as the trigger. In other words, you can have a single X10 address contain a DS10A and all security macros that it triggers.
Keep in mind that the DS10A cannot directly trigger a macro set to this X10 address and triggering this X10 address will not trigger a security macro.
If you were thinking of reusing that X10 address for a different module, I'm not sure how AHP would respond. Since more than one module can be on that same address, then it may not be a problem. I wouldn't recommend it unless you already used up all 256 X10 addresses.
In case I didn't answer your question, can you give an example of how you would want to use it?