Creating Stock using external data source

Hello Experts,

need your suggestion with the following.

I am trying to create stock(Stock in transit - Category CS) entries using BAPI_STSRVAPS_SAVEMULTI2

but the problem is

i want this to be created for a future start date instead of 01/01/1970 which will shown in initial time bucket; meaning this should be visible in next month bucket (as the delivery lead  time is 7 weeks)

I am trying to address similar problem as in any suggestions appreciated.- All i want to do is create a receipt element in RRP3 with start date = current date+7 weeks http://scn.sap.com/thread/3347113

Thanks in advance