Putaway rule

Hi All

we have a requirement to derive subinv by catogery and locator by last put away rule

Rule is created as follows

1. when source is receiving

2. catogery=catogery name

3. destination subinventories in  (A,B)  picking order priority

4.  destination locator by function which retrives last po receipt transaction

    we are hardcoding subinventory name in function like subinventory name in (A,B)

is there any way that we can pass this value dynamically like MPTDTV Subinventory code (To or  From)

Need quick help from all gurus

Sriram