Intended Use of FND_FLEX_EXT.GET_COMBINATION_ID

So, I've reviewed FND_FLEX_EXT, specifically GET_COMBINATION_ID. When I've googled for how its used, I've found examples such as the following

https://imdjkoch.wordpress.com/tag/fnd_flex_ext-get_combination_id/

My question: Can this function ONLY be used to retrieve/create a CCID for General Ledger? Can it be used for Costing? Say in the above example on the query for the id_flex_num, is it valid to do the following when you know that a costing allocation flexfield exists?

Retrieve the flex_id_num, fill the segment array with costing segment values instead of G/L Values then call get_combination_id?