Here are some useful query transactions, note that some rely on LIS records, so it must be activated:
MB51 Material Doc. List
MB5L List of Stock Values: Balances
MBBS Display valuated special stock
MC$G PURCHIS: Material PurchVal Selection
MC$I PURCHIS: Material PurchQty Selection
MC.1 INVCO: Plant Anal. Selection: Stock
MC.2 INVCO: Plant Anal.Selection, Rec/Iss
MC.5 INVCO: SLoc Anal. Selection, Stock
MC.9 INVCO: Material Anal.Selection,Stock
MC.A INVCO: Mat.Anal.Selection, Rec/Iss
MC.L INVCO: Mat.Group Analysis Sel. Stock
MC48 INVCO: Anal. of Current Stock Values
MC50 INVCO: Analysis of Dead Stock
MCBA INVCO: Plant Analysis Selection
MCBC INVCO: Stor. Loc. Analysis Selection
MCBE INVCO: Material Analysis Selection
MCBK INVCO: MatGrp Analysis Selection
MCBR INVCO: Batch Analysis Selection
MCE1 PURCHIS: PurchGrp Analysis Selection
MCE3 PURCHIS: Vendor Analysis Selection
MCE5 PURCHIS: MatGrp Analysis Selection
MCE7 PURCHIS: Material Analysis Selection
MCW3 PURCHIS: Evaluate VBD Header
MCW4 PURCHIS: Evaluate VBD Item
ME2L Purchase Orders by Vendor
ME2M Purchase Orders by Material
ME2N Purchase Orders by PO Number
MIR6 Invoice Overview
MMBE Stock Overview