Hi Edi,
Try to check below data sources and test below in your system with examples. Not sure but below could be useful.
2LIS_03_BX - Aging inventory report
2LIS_11_VAKON or 2LIS_13_VDKON -Booking with Pricing Condition
2LIS_06_INV - Purchase Doc No / Billing Doc / Vendor Invoice
2LIS_02_SGR- PO Item Goods Receipt Detail
Srikanth.