BW:Inventory stock Report issue based on Vendor and PO number

Dear Guru's.

Requirement is to report different inventory  stock's (Total Stock, blocked stock, stock in transit..etc) based on plant, material, storage location, vendor and purchase order in BW.

For Example:

If we drag the Vendor or Purchase Order Number into the report, Data gets Splitted into +ve (Inflow) and -Ve(Outflow) values.

For Example:

I Think this is because no vendor assigned to outflow data. this is my guess i don't have much knowledge on MM. i have tried to restrict the keyfig's with stock category, but for most of the vendors or PO 's its unassigned.

But we need the data in single as follows. can any one suggest me any steps to achieve this in BI or BO.

Thanks in Advance,

Dev