CS_BOM_EXPL_EQU_V2

I am trying to use the function module but am not able to get any values displayed. The scenario is as follows:

1) I have equipment with BOM. I can see this if I take the Equipment Number into transaction IB03 and also the tables STKO and STOP

2) When I run function module CS_BOM_EXPL_EQU_V2 there are a large number of input parameters which are optional (some of which have a default value)

3) If I run the module as it is I do not get any values and there is an Exception CALL_INVALID

Can someone give a step by step to use this FM. Thanks