Virtual cube with services - internal table I_TH_SFC

I have a BCS virtual cube w/services.

The function module of the virtual cube has an import parameter I_TH_SFC

Which contains mappings of characteristics in query drilldown.

Example: CHANM = 0BCS_CGPCTR, CHAALIAS=K____896

I want to simulated a drilldown on a characteristic by adding manually in ABAP

An entry in parameter table I_TH_SFC, to meet customer req.

Example: CHANM = 0COMPANY, CHAALIAS=K____???

I need to determine the CHAALIAS based on CHANM.

My understanding is that these aliases are created

By OLAP engine when query is save.

Anyone know where these mappings are stored?