> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/decision-tables/lum.dtl/obj_num.md).

# obj\_num

If *obj\_num* = 0, the condition will be checked for the current object of the type specified by [obj](/io-docs/introduction-1/decision-tables/lum.dtl/obj.md). If *obj\_num* > 0, the condition will be checked for the object with the specified ID (in the object's [connect](/io-docs/introduction-1/connectivity/hru.con.md) file) only. 

Exception: prob\_unif where obj\_num is the first day of the period.