Key figure for Initial Stock...

I understand that the function INITIAL_STOCK in used in Macro for calculation of "Stock on hand".

From where, does the function INITIAL_STOCK extracts the data ... I mean, does it extracts data from a key figure ? If so, which key figure is that... ?

It would really of great help to me...

My case is... I have to upload the stock for a product location combination by updating a key figure in APO system... For the scenario I am handling here, the stock cannot be transferred from R3.

Awaiting for early replies...

Thanks & Regards,

Kris