Customer Exit (i_step = 1) for hierarchy variable

All,

I have a requirement to insert a default hierarchy variable based on the sy-uname running a query. The user should also have the ability to change this value if required.

I have created a hierarchy variable:

General Tab:

Type = Hierarchy Node

Processing By: Manual Input/Default Value

Reference Characteristic = Profit_ctr

Details:

Several Single Values

Mandatory

Variable is Ready for Input

In CMOD I have a case statement for i_step.

when 1, I want it to execute my code to determine the profit centre of the user.

However when I add a break-point, it stops at another variable I have created (a date variable - interval/mandatory) no problem, but doesn't stop for my hierarchy variable.

Is it not possible to set a default value for hierarchies?

I'd be very grateful if anyone can explain how I can do this. I need the values to be pre-populated in the selection box.

Alternatively if it is not possible as standard, where the code breaks for the date variable at step1, is there another way I can add my hierarchy variable row into itab i_t_var_range?

We are running BW7.4 SP6

Thanks.